Move Ash-specific vector icon files into a separate directory

Move Ash-specific vector icon files into a separate directory

Move all of the Ash-specific .icon files from
ui/gfx/vector_icons into their own subdirectory
ui/gfx/vector_icons/ash.

BUG=626786
TEST=manual

[tdanderson, 2016-07-09 22:24:14]

tdanderson@chromium.org changed reviewers:
+ brettw@chromium.org, estade@chromium.org

[tdanderson, 2016-07-09 22:24:15]

Brett and Evan, can you please take a look? (Evan, I have also updated the
developer documentation on chromium.org; please take a look at that too).

[Evan Stade, 2016-07-11 15:41:30]

build failures look relevant

[tdanderson, 2016-07-18 18:43:23]

The CQ bit was checked by tdanderson@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-07-18 18:43:58]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-07-18 19:05:16]

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

[commit-bot: I haz the power, 2016-07-18 19:05:17]

Dry run: Try jobs failed on following builders:
  win_chromium_x64_rel_ng on master.tryserver.chromium.win (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.win/builders/win_chromium_x64_...)

[tdanderson, 2016-08-19 21:26:49]

On 2016/07/11 15:41:30, Evan Stade wrote:
> build failures look relevant

This won't work. See new WIP at https://codereview.chromium.org/2251643011/.