Changed android toolchain to use GCC 4.8

Changed android toolchain to use GCC 4.8

BUG=359106
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=271207

[Fabrice (no longer in Chrome), 2014-05-15 16:51:13]

Hi all,
This is to (finally) land GCC 4.8 on Android.
I am not sure about the reviewers. If you think we need someone else's approval,
do add them!

[Nico, 2014-05-16 00:06:31]

Hooray!

Looks like you need to put "-Wno-unused-local-typedefs" in some gn file
(probably uild/config/compiler/BUILD.gn). With that, lgtm (there's a trybot that
checks that this worked – if you get a green android_chromium_gn_compile_rel 
run, all is well.)

(It looks like a bunch of other android compile flags in the gn file haven't
kept up with reality either, but that's not your thing to fix, and for sure not
in this CL.)

[Fabrice (no longer in Chrome), 2014-05-16 11:46:32]

Okay, I think that fixed it. I also added our new Android-specific flags to gn.
I'm not too familiar with gn, so hopefully I didn't break every other build.

[pasko, 2014-05-16 14:01:59]

LGTM++ with .gn* reviewed by brettw@

[brettw, 2014-05-16 16:54:21]

Sweet, thanks for updating the GN build. LGTM

https://codereview.chromium.org/218633007/diff/200001/build/config/compiler/B...
File build/config/compiler/BUILD.gn (right):

https://codereview.chromium.org/218633007/diff/200001/build/config/compiler/B...
build/config/compiler/BUILD.gn:218: 
Got extra blank in here.

[Fabrice (no longer in Chrome), 2014-05-16 17:08:24]

Thanks, looks like we're good to go!

https://codereview.chromium.org/218633007/diff/200001/build/config/compiler/B...
File build/config/compiler/BUILD.gn (right):

https://codereview.chromium.org/218633007/diff/200001/build/config/compiler/B...
build/config/compiler/BUILD.gn:218: 
On 2014/05/16 16:54:21, brettw wrote:
> Got extra blank in here.

Done.

[Fabrice (no longer in Chrome), 2014-05-16 17:08:29]

The CQ bit was checked by fdegans@chromium.org

[commit-bot: I haz the power, 2014-05-16 17:09:04]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/fdegans@chromium.org/218633007/220001

[commit-bot: I haz the power, 2014-05-16 21:18:28]

FYI, CQ is re-trying this CL (attempt #1).
Please consider checking whether the failures are real,
and report flakes to chrome-troopers@google.com.
The failing builders are:
  android_dbg on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/android_dbg/builds/18...)

[commit-bot: I haz the power, 2014-05-17 15:41:57]

Change committed as 271207