Revert of Revert of Use the new java_cpp_enum rule in content.

Revert of Revert of Use the new java_cpp_enum rule in content. (patchset #1 id:1 of https://codereview.chromium.org/625543002/)

Reason for revert:
Oops, wasn't supposed to revert this after all.

Original issue's description:
> Revert of Use the new java_cpp_enum rule in content. (patchset #8 id:140001 of https://codereview.chromium.org/615893003/)
>
> Reason for revert:
> Fails to compile on several bots:
>
> https://chromegw.corp.google.com/i/clank.tot/builders/clang-clankium-tot-builder/builds/56800/steps/compile/logs/stdio
>
> First error:
> FAILED: cd ../../clank/native/framework; python <snip ...>
> ../../../clank/java/apps/chrome/src/com/google/android/apps/chrome/webapps/FullScreenActivityTab.java:28: error: cannot find symbol
> import org.chromium.content.common.TopControlsState;
>                                   ^
>   symbol:   class TopControlsState
>   location: package org.chromium.content.common
>
> Original issue's description:
> > Use the new java_cpp_enum rule in content.
> >
> > This moves most of the generated Java enums under content/ to use the
> > java_cpp_enum rule removing the need for keeping the enums in
> > separate list files and the need for the .template files.
> >
> > BUG=405532, 351558
> >
> > Committed: https://crrev.com/7d5f0a581ba2f0e79b09ecbf6127ad453a861a96
> > Cr-Commit-Position: refs/heads/master@{#297789}
>
> TBR=jam@chromium.org,yfriedman@chromium.org,scottmg@chromium.org,jdduke@chromium.org,brettw@chromium.org,mkosiba@chromium.org
> NOTREECHECKS=true
> NOTRY=true
> BUG=405532, 351558
>
> Committed: https://crrev.com/949b6e5050c7a2ee2a894799db19ec325ba911ef
> Cr-Commit-Position: refs/heads/master@{#297793}

TBR=jam@chromium.org,yfriedman@chromium.org,scottmg@chromium.org,jdduke@chromium.org,brettw@chromium.org,mkosiba@chromium.org,perezju@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=405532, 351558
Committed: https://crrev.com/4db84b031042bf4f99720372f657ff53e4503a16
Cr-Commit-Position: refs/heads/master@{#297794}

[Sami, 2014-10-02 10:08:03]

Created Revert of Revert of Use the new java_cpp_enum rule in content.

[commit-bot: I haz the power, 2014-10-02 10:08:22]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/617103007/1

[commit-bot: I haz the power, 2014-10-02 10:09:04]

Committed patchset #1 (id:1) as 3e181d0abd6154791ef610eea18bf3bc7e1d215d

[commit-bot: I haz the power, 2014-10-02 10:09:44]

Patchset 1 (id:??) landed as
https://crrev.com/4db84b031042bf4f99720372f657ff53e4503a16
Cr-Commit-Position: refs/heads/master@{#297794}