Resubmit: Remove deprecated extension notification from WebstoreStartupInstallerTest

Resubmit: Remove deprecated extension notification from WebstoreStartupInstallerTest

This CL fixes the previous reverted CL#437603002.
To fix, removed ExtensionRegistryObserver from TearDownOnMainThread instead of destructor.

R=kalman@chromium.org
BUG=354046
TEST=browser_tests

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=287414

[limasdf, 2014-08-04 10:48:24]

Benjamin, PTAL!

CC:jamescook, Thanks for the hint!

[not at google - send to devlin, 2014-08-04 15:46:05]

lgtm

https://codereview.chromium.org/429173003/diff/1/chrome/browser/extensions/we...
File chrome/browser/extensions/webstore_startup_installer_browsertest.cc
(right):

https://codereview.chromium.org/429173003/diff/1/chrome/browser/extensions/we...
chrome/browser/extensions/webstore_startup_installer_browsertest.cc:260:
->RemoveObserver(this);
also run WebstoreStartupInstallerTest::TearDownOnMainThread() after this.

[limasdf, 2014-08-04 16:38:09]

https://codereview.chromium.org/429173003/diff/1/chrome/browser/extensions/we...
File chrome/browser/extensions/webstore_startup_installer_browsertest.cc
(right):

https://codereview.chromium.org/429173003/diff/1/chrome/browser/extensions/we...
chrome/browser/extensions/webstore_startup_installer_browsertest.cc:260:
->RemoveObserver(this);
On 2014/08/04 15:46:05, kalman wrote:
> also run WebstoreStartupInstallerTest::TearDownOnMainThread() after this.

Done.

[limasdf, 2014-08-04 16:38:15]

The CQ bit was checked by limasdf@gmail.com

[commit-bot: I haz the power, 2014-08-04 16:38:40]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/limasdf@gmail.com/429173003/20001

[commit-bot: I haz the power, 2014-08-05 00:12:29]

Change committed as 287414