DEPS.xwalk: Roll v8-crosswalk (ad45c4e -> 7fa32ec)

7fa32ec Fix invalid native context reference in simd128-tag

BUG=XWALK-2255
Merge pull request #2317 from darktears/crosswalk-8

Roll Chromium 37.0.2062.76
Bump version to 8.37.189.5
Merge pull request #2328 from huningxin/crosswalk-8

DEPS.xwalk: Roll v8-crosswalk (ad45c4e -> 7fa32ec)
Bump version to 8.37.189.6
Do not use scripting inside gclient

After recent changes on depot_tools, using "for loops" inside gclient
config file apparently is not possible anymore. Also, the "solutions"
now has to be explicitly declared.

BUG=XWALK-2379

(cherry picked from commit 60aaa8bec57badb4d98e13ed9b36cf425211d990)
DEPS.xwalk: Remove duplicate lines.

Remove a few duplicate comments added by 60aaa8bec ("Do not use
scripting inside gclient").

(cherry picked from commit e208770a0473c7600f24599676856d12f89a00cc)
Merge pull request #2348 from rakuco/backport-gclient-fixes

Backport gclient fixes
[Android] Fix fullscreen not working issue on Android versions < 4.2

Change the values-v17 to values-v14, as we support Android versions >= 4.0

BUG=XWALK-2307

(cherry picked from commit a5eaa79fda72eb585ebf7e362d3ae999913fffe6)
Merge pull request #2351 from kurli/crosswalk-8-v14

[Android] Fix fullscreen not working issue on Android versions < 4.2
Roll stable M37.0.2062.94