Pull ICU, rename component build GN variables.

Pull ICU, rename component build GN variables.

This ICU roll only renames component_mode -> is_component_build

Update other users of the component_mode string to is_component_build.

Rename the declaration to be local to BUILDCONFIG.gn (prefixed with '_').

Removes a bitrotted GN unit test around component handing (it wasn't
testing anything useful any more since we removed the built-in
component function).

Committed: https://crrev.com/2a08763777c45ca4e7a00a846266bbfed31ef673
Cr-Commit-Position: refs/heads/master@{#342204}

[brettw, 2015-08-05 16:22:54]

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

[brettw, 2015-08-05 16:22:57]

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

[commit-bot: I haz the power, 2015-08-05 16:23:28]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1275583002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1275583002/1

[commit-bot: I haz the power, 2015-08-05 16:30:17]

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

[commit-bot: I haz the power, 2015-08-05 16:30:17]

Dry run: Try jobs failed on following builders:
  win8_chromium_ng on tryserver.chromium.win (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.win/builders/win8_chromium_ng/...)

[brettw, 2015-08-05 16:43:38]

Blocked on https://codereview.chromium.org/1277503003 and WebKit roll

[Dirk Pranke, 2015-08-05 18:38:37]

lgtm

[brettw, 2015-08-06 16:48:44]

The CQ bit was checked by brettw@chromium.org

[commit-bot: I haz the power, 2015-08-06 16:49:27]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1275583002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1275583002/1

[commit-bot: I haz the power, 2015-08-06 19:57:47]

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

[commit-bot: I haz the power, 2015-08-06 19:57:48]

Try jobs failed on following builders:
  win_chromium_rel_ng on tryserver.chromium.win (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.win/builders/win_chromium_rel_...)

[brettw, 2015-08-06 20:00:56]

The CQ bit was checked by brettw@chromium.org

[commit-bot: I haz the power, 2015-08-06 20:01:43]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1275583002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1275583002/1

[commit-bot: I haz the power, 2015-08-06 21:39:05]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-08-06 21:39:53]

Patchset 1 (id:??) landed as
https://crrev.com/2a08763777c45ca4e7a00a846266bbfed31ef673
Cr-Commit-Position: refs/heads/master@{#342204}