[Web Intents] Inline installation of extensions in web intents picker.

[Web Intents] Inline installation of extensions in web intents picker. 
Initial CL: http://codereview.chromium.org/9595031/ 
Second try: http://codereview.chromium.org/9763001/

BUG=113476
TEST=WebIntentsRegistryTest.GetIntentServicesForExtensionFilter, WebIntentPickerControllerBrowserTest.ExtensionInstallSuccess

TBR=rsesek@chromium.org

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=128189

[binji, 2012-03-21 01:20:46]

Really stupid bug... I feel dumb.

[groby-ooo-7-16, 2012-03-21 01:24:12]

LGTM - but care to share what the issue was that made it flaky?

[binji, 2012-03-21 01:47:26]

On 2012/03/21 01:24:12, groby wrote:
> LGTM - but care to share what the issue was that made it flaky?

extensions_ is an ExtensionSet, which internally has a std::map of extension id
to scoped_refptr<Extension>. The order of elements in the map is entirely
dependent on the id, which for tests is auto-generated from the path to the
installed extension.

I just happened to grab the first extension, which apparently maps correctly to
the edit_extension on linux, but maps to the share_extension on mac and
linux(debug)(shared).

[binji, 2012-03-21 20:40:00]

+rsesek cocoa OWNERS TBR

[commit-bot: I haz the power, 2012-03-21 20:40:21]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/binji@chromium.org/9799001/2001

[commit-bot: I haz the power, 2012-03-22 09:46:38]

Change committed as 128189