Make bazel build fully hermetic

We no longer reference @bazel_tools//third_party. All of our transitive
dependencies are now specified explicitly in our WORKSPACE file.

I also fixed the way that jar dependencies are exported, so we don't
break strict dependency checking.
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=116421176

third_party/java/appengine_pipeline/BUILD

@@ -4,11 +4,10 @@ licenses(["notice"])  # Apache License 2.0
 
 java_library(
     name = "appengine_pipeline",
-    exports = [
-        "@appengine_pipeline//jar",
-        "@bazel_tools//third_party:guava",
+    exports = ["@appengine_pipeline//jar"],
+    runtime_deps = [
+        "@guava//jar",
         "@json//jar",
-        "//third_party/java/appengine:appengine-api",
         "//third_party/java/appengine_gcs_client",
         "//third_party/java/servlet/servlet_api",
     ],