Revert of Revert of GN: Explicitly list out public headers in the blink_headers source_set

Revert of Revert of GN: Explicitly list out public headers in the blink_headers source_set (patchset #1 id:1 of https://codereview.chromium.org/1224843009/)

Reason for revert:
Re-landing now that https://crrev.com/deb02768bf9805279461259119a845aa2c734e25 is landed (fixes the gn check errors this introduced the first time around)

Original issue's description:
> Revert of GN: Explicitly list out public headers in the blink_headers source_set (patchset #2 id:20001 of https://codereview.chromium.org/1222673004/)
> 
> Reason for revert:
> This patch is causing build failures:
> http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_gn_rel/builds/107230/steps/gn_check%20%28with%20patch%29/logs/stdio
> 
> Original issue's description:
> > GN: Explicitly list out public headers in the blink_headers source_set
> > 
> > This enables "gn check" to enforce that source files that #include
> > these headers also declare a dependency on them in GN.
> > 
> > This also fixes "gn check" on Android from having errors like:
> > 
> > ERROR at //components/autofill/content/renderer/autofill_agent.cc:45:11: Include not allowed.
> >           ^--------------------------------------------
> > It is not in any dependency of
> >   //components/autofill/content/renderer:renderer
> > The include file is in the target(s):
> >   //third_party/WebKit/public:blink_headers_java_enums_srcjar__generate_enum
> > which should somehow be reachable.
> > 
> > BUG=367595
> > 
> > Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=198439
> 
> TBR=dpranke@chromium.org,esprehn@chromium.org,agrieve@chromium.org
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=367595
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=198520

TBR=dpranke@chromium.org,esprehn@chromium.org,pdr@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=367595
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=198544

[agrieve, 2015-07-08 22:32:45]

Created Revert of Revert of GN: Explicitly list out public headers in the
blink_headers source_set

[commit-bot: I haz the power, 2015-07-08 22:33:07]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1228703004/1

[commit-bot: I haz the power, 2015-07-08 22:33:17]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-07-08 22:33:18]

No L-G-T-M from a valid reviewer yet. Only full committers are accepted.
Even if an L-G-T-M may have been provided, it was from a non-committer,
_not_ a full super star committer.
See http://www.chromium.org/getting-involved/become-a-committer
Note that this has nothing to do with OWNERS files.

[Dirk Pranke, 2015-07-08 23:32:32]

lgtm

[Dirk Pranke, 2015-07-08 23:32:41]

The CQ bit was checked by dpranke@chromium.org

[commit-bot: I haz the power, 2015-07-08 23:32:58]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1228703004/1

[commit-bot: I haz the power, 2015-07-08 23:33:25]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=198544

[pdr., 2015-07-08 23:34:17]

On 2015/07/08 at 23:33:25, commit-bot wrote:
> Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=198544

Oh no, this should have been put through the CQ. Alas, lets keep an eye on the
bots.

[Dirk Pranke, 2015-07-08 23:40:10]

On 2015/07/08 23:34:17, pdr wrote:
> On 2015/07/08 at 23:33:25, commit-bot wrote:
> > Committed patchset #1 (id:1) as
> https://src.chromium.org/viewvc/blink?view=rev&revision=198544
> 
> Oh no, this should have been put through the CQ. Alas, lets keep an eye on the
> bots.

Yeah, I tried to use the CQ but didn't realize that we had NOPRESUBMIT et. al.
:(.

[agrieve, 2015-07-09 00:05:01]

On 2015/07/08 23:40:10, Dirk Pranke wrote:
> On 2015/07/08 23:34:17, pdr wrote:
> > On 2015/07/08 at 23:33:25, commit-bot wrote:
> > > Committed patchset #1 (id:1) as
> > https://src.chromium.org/viewvc/blink?view=rev&revision=198544
> > 
> > Oh no, this should have been put through the CQ. Alas, lets keep an eye on
the
> > bots.
> 
> Yeah, I tried to use the CQ but didn't realize that we had NOPRESUBMIT et. al.
> :(.

Whoops! Sorry to set you up like that :S. Just clicked the "Revert Patchset"
button and didn't realize it would have such side-effects. I'm around for the
next couple of hours anyways, so will keep an eye on
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...