Revert of Temporarily suppress Android API deprecation warnings. (patchset #1 id:1 of https://chromiumcodereview.appspot.com/615163002/)

Reason for revert:
We have switched to L sdk.

Original issue's description:
> Temporarily suppress Android API deprecation warnings.
>
> We will remove this suppression once all of the builders support the L SDK.
>
> BUG=405174,398669,411361,411366,411367,411376,416041
>
> Committed: https://crrev.com/c26c106e7724c400fed9980ce371a1c81d1af849
> Cr-Commit-Position: refs/heads/master@{#297505}

TBR=dmazzoni@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=405174,398669,411361,411366,411367,411376,416041

Review URL: https://codereview.chromium.org/649653004

Cr-Original-Commit-Position: refs/heads/master@{#300294}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 899f630a25669232d5817b8a6d7d365fb7adc42a

android/gyp/javac.py

@@ -77,11 +77,7 @@ def DoJavac(
       '-classpath', ':'.join(classpath),
       '-d', classes_dir]
   if chromium_code:
-    javac_args.extend(['-Xlint:unchecked'])
-    # TODO(aurimas): re-enable this after the L SDK is launched and make
-    # everyone fix new deprecation warnings correctly.
-    # http://crbug.com/405174,398669,411361,411366,411367,411376,416041
-    # '-Xlint:deprecation'
+    javac_args.extend(['-Xlint:unchecked', '-Xlint:deprecation'])
   else:
     # XDignore.symbol.file makes javac compile against rt.jar instead of
     # ct.sym. This means that using a java internal package/class will not
@@ -264,3 +260,5 @@ def main(argv):
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv[1:]))
+
+