Extract UI dependencies from ExtensionHost, part 3

Extract UI dependencies from ExtensionHost, part 3

1. Move WebContentsModalDialog support to ExtensionViewHost, as it is only
used by extension popups.
2. Break reliance on ChromeWebModalDialogManagerDelegate by providing our
own one-line IsWebContentsVisible() implementation.
3. Remove a bunch of OS_ANDROID ifdefs, since Android can use the components
module where web_modal stuff is implemented.

BUG=321341
TEST=browser_tests, esp. DownloadExtensionTest.DownloadExtensionTest_AcceptDanger

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=238436

[James Cook, 2013-11-27 22:20:06]

yoz, PTAL

bulach, can I get OWNERS for adding another stub function to
c/b/ui/android/extension_view_android.h ?

[bulach, 2013-11-28 09:19:35]

lgtm for android, thanks!

[James Cook, 2013-12-02 21:36:44]

yoz, friendly ping?

[Yoyo Zhou, 2013-12-02 23:24:42]

LGTM

[commit-bot: I haz the power, 2013-12-02 23:33:29]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/jamescook@chromium.org/92743002/40001

[commit-bot: I haz the power, 2013-12-03 01:59:59]

Retried try job too often on mac_rel for step(s) browser_tests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=mac_rel&nu...

[commit-bot: I haz the power, 2013-12-03 16:48:41]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/jamescook@chromium.org/92743002/40001

[commit-bot: I haz the power, 2013-12-03 18:39:57]

Change committed as 238436