Move unit_tests sources to variables section in .gypi file.

Move unit_tests sources to variables section in .gypi file.

This is preparing for a GN unit test target that shares the sources list. This change only moves the main files list to minimize merge conflicts in the future steps.

TBR=jamesr

Committed: https://crrev.com/fbf6db920f83490b1b593e47c9555fd64183475a
Cr-Commit-Position: refs/heads/master@{#294693}

[brettw, 2014-09-12 20:33:25]

brettw@chromium.org changed reviewers:
+ jamesr@chromium.org

[brettw, 2014-09-12 20:34:05]

This is the .gypi change from this patch:
https://codereview.chromium.org/559543003/
which was already reviewed. That one had merge conflicts so I'm separating out
the massive file name move.

[brettw, 2014-09-12 20:34:13]

The CQ bit was checked by brettw@chromium.org

[commit-bot: I haz the power, 2014-09-12 20:36:02]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patchset/568923002/1

[jamesr, 2014-09-12 20:48:24]

rslgtm

[commit-bot: I haz the power, 2014-09-12 21:24:01]

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

[commit-bot: I haz the power, 2014-09-12 21:24:02]

Try jobs failed on following builders:
  android_clang_dbg_recipe on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/android_clang_d...)
  android_dbg_tests_recipe on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/android_dbg_tes...)
  mac_chromium_compile_dbg on tryserver.chromium.mac
(http://build.chromium.org/p/tryserver.chromium.mac/builders/mac_chromium_comp...)

[brettw, 2014-09-12 22:22:09]

The CQ bit was checked by brettw@chromium.org

[commit-bot: I haz the power, 2014-09-12 22:23:31]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patchset/568923002/20001

[commit-bot: I haz the power, 2014-09-12 23:26:08]

Committed patchset #2 (id:20001) as 12c791699a4a3de7af8414812f300aa7d3e5fbb9

[commit-bot: I haz the power, 2014-09-12 23:40:39]

Patchset 2 (id:??) landed as
https://crrev.com/fbf6db920f83490b1b593e47c9555fd64183475a
Cr-Commit-Position: refs/heads/master@{#294693}