Replace to(Upper|Lower)Case with Ascii.to$1Case

The presubmits are warning that toUpperCase() and toLowerCase() are locale-specific, and advise using Ascii.toUpperCase() and Ascii.toLowerCase() as a local-invariant alternative.
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=127583677

java/google/registry/tools/AllocateDomainCommand.java

@@ -26,6 +26,7 @@ import static google.registry.tools.CommandUtilities.addHeader;
 
 import com.beust.jcommander.Parameter;
 import com.beust.jcommander.Parameters;
+import com.google.common.base.Ascii;
 import com.google.common.base.Function;
 import com.google.common.base.Joiner;
 import com.google.common.base.Splitter;
@@ -134,7 +135,7 @@ final class AllocateDomainCommand extends MutatingEppToolCommand {
             ImmutableMap.Builder<String, String> contactsMapBuilder = new ImmutableMap.Builder<>();
             for (DesignatedContact contact : application.getContacts()) {
               contactsMapBuilder.put(
-                  contact.getType().toString().toLowerCase(),
+                  Ascii.toLowerCase(contact.getType().toString()),
                   contact.getContactRef().get().getForeignKey());
             }
             LaunchNotice launchNotice = application.getLaunchNotice();

java/google/registry/tools/CommandUtilities.java

@@ -14,6 +14,7 @@
 
 package google.registry.tools;
 
+import com.google.common.base.Ascii;
 import com.google.common.base.Strings;
 
 /** Container class for static utility methods. */
@@ -25,6 +26,6 @@ class CommandUtilities {
 
   /** Prompts for yes/no input using promptText, defaulting to no. */
   static boolean promptForYes(String promptText) {
-    return System.console().readLine(promptText + " (y/N): ").toUpperCase().startsWith("Y");
+    return Ascii.toUpperCase(System.console().readLine(promptText + " (y/N): ")).startsWith("Y");
   }
 }

java/google/registry/tools/ConvertIdnCommand.java

@@ -19,6 +19,7 @@ import static google.registry.util.DomainNameUtils.canonicalizeDomainName;
 
 import com.beust.jcommander.Parameter;
 import com.beust.jcommander.Parameters;
+import com.google.common.base.Ascii;
 import google.registry.tools.Command.GtechCommand;
 import google.registry.util.Idn;
 import java.io.IOException;
@@ -37,7 +38,7 @@ final class ConvertIdnCommand implements Command, GtechCommand {
   public void run() throws IOException {
     for (String label : mainParameters) {
       if (label.startsWith(ACE_PREFIX)) {
-        System.out.println(Idn.toUnicode(label.toLowerCase()));
+        System.out.println(Idn.toUnicode(Ascii.toLowerCase(label)));
       } else {
         System.out.println(canonicalizeDomainName(label));
       }

java/google/registry/tools/DomainApplicationInfoCommand.java

@@ -18,6 +18,7 @@ import static google.registry.util.PreconditionsUtils.checkArgumentNotNull;
 
 import com.beust.jcommander.Parameter;
 import com.beust.jcommander.Parameters;
+import com.google.common.base.Ascii;
 import com.google.template.soy.data.SoyMapData;
 import google.registry.model.domain.launch.LaunchPhase;
 import google.registry.tools.Command.GtechCommand;
@@ -53,8 +54,8 @@ final class DomainApplicationInfoCommand extends EppToolCommand implements Gtech
 
   @Override
   void initEppToolCommand() {
-    LaunchPhase launchPhase =
-        checkArgumentNotNull(LaunchPhase.fromValue(phase.toLowerCase()), "Illegal launch phase.");
+    LaunchPhase launchPhase = checkArgumentNotNull(
+        LaunchPhase.fromValue(Ascii.toLowerCase(phase)), "Illegal launch phase.");
 
     setSoyTemplate(
         DomainApplicationInfoSoyInfo.getInstance(),

java/google/registry/tools/RegistryToolEnvironment.java

@@ -17,6 +17,7 @@ package google.registry.tools;
 import static com.google.common.base.Preconditions.checkArgument;
 import static com.google.common.base.Preconditions.checkState;
 
+import com.google.common.base.Ascii;
 import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableMap;
 import google.registry.config.RegistryEnvironment;
@@ -61,7 +62,7 @@ enum RegistryToolEnvironment {
    * @see #get()
    */
   static RegistryToolEnvironment parseFromArgs(String[] args) {
-    return valueOf(getFlagValue(args, FLAGS).toUpperCase());
+    return valueOf(Ascii.toUpperCase(getFlagValue(args, FLAGS)));
   }
 
   /**

java/google/registry/tools/server/VerifyOteAction.java

@@ -23,6 +23,7 @@ import static google.registry.util.CollectionUtils.isNullOrEmpty;
 import static google.registry.util.DomainNameUtils.ACE_PREFIX;
 import static java.util.Arrays.asList;
 
+import com.google.common.base.Ascii;
 import com.google.common.base.Function;
 import com.google.common.base.Joiner;
 import com.google.common.base.Predicate;
@@ -250,7 +251,7 @@ public class VerifyOteAction implements Runnable, JsonAction {
 
     /** Returns a more human-readable translation of the enum constant. */
     String description() {
-      return this.name().replace('_', ' ').toLowerCase();
+      return Ascii.toLowerCase(this.name().replace('_', ' '));
     }
 
     /** An {@link EppInput} might match multiple actions, so check if this action matches. */