Remove app_shell chrome.shell API and ShellAppWindow

Remove app_shell chrome.shell API and ShellAppWindow

The chrome.app.window API has been moved to src/extensions, so app_shell
no longer needs its custom chrome.shell API to open windows.

* Remove the API implementation -- mostly a manual revert of https://codereview.chromium.org/254473011/
* Remove app_shell_resources.grd since there are no more app_shell resources
* Remove athena's support for ShellAppWindow
* Fix example apps to remove the chrome.shell workaround.

No presubmit because it has a false-positive warning about the enum rename in extension_function_histogram_value.h

No try because no presubmit doesn't seem to work by itself.

BUG=413164
TEST=extensions_unittests, app_shell_unittests, app_shell_browsertests
TBR=isherman@chromium.org for deprecating an extension function histogram
NOPRESUBMIT=true
NOTRY=true

Committed: https://crrev.com/877e2ab661da959e844d0f0f1e71f815d32d8c77
Cr-Commit-Position: refs/heads/master@{#294852}

[James Cook, 2014-09-12 21:44:24]

jamescook@chromium.org changed reviewers:
+ oshima@chromium.org, rockot@chromium.org

[James Cook, 2014-09-12 21:44:25]

rockot, PTAL at extensions/*

oshima, PTAL at athena/*

[oshima, 2014-09-12 22:56:39]

athena lgtm

[Ken Rockot(use gerrit already), 2014-09-12 23:52:38]

lgtm

[James Cook, 2014-09-13 00:06:23]

The CQ bit was checked by jamescook@chromium.org

[commit-bot: I haz the power, 2014-09-13 00:18:32]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patchset/571643003/40001

[commit-bot: I haz the power, 2014-09-13 01:16:05]

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

[commit-bot: I haz the power, 2014-09-13 01:16:06]

Try jobs failed on following builders:
  chromium_presubmit on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/chromium_presub...)

[James Cook, 2014-09-15 16:10:01]

The CQ bit was checked by jamescook@chromium.org

[commit-bot: I haz the power, 2014-09-15 16:19:34]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patchset/571643003/60001

[commit-bot: I haz the power, 2014-09-15 16:40:05]

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

[commit-bot: I haz the power, 2014-09-15 16:40:06]

Try jobs failed on following builders:
  chromium_presubmit on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/chromium_presub...)

[James Cook, 2014-09-15 17:36:35]

The CQ bit was checked by jamescook@chromium.org

[commit-bot: I haz the power, 2014-09-15 18:02:02]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patchset/571643003/60001

[commit-bot: I haz the power, 2014-09-15 18:29:04]

Committed patchset #4 (id:60001) as 07316bf01fe4aa54b8c85babdce7a3e538d2ac6b

[commit-bot: I haz the power, 2014-09-15 18:34:50]

Patchset 4 (id:??) landed as
https://crrev.com/877e2ab661da959e844d0f0f1e71f815d32d8c77
Cr-Commit-Position: refs/heads/master@{#294852}