Fix crasher in LocationBarViewMac::PageActionImageView::OnImageLoaded.
Fix crasher in LocationBarViewMac::PageActionImageView::OnImageLoaded.

Scott's insight in comment 18 on the bug report was correct; fixed by relinquishing control on call to UpdatePageActions, so that we don't try to look at the private variables of a dying this ptr.

BUG= 35864
TEST= no crash.

Review URL: http://codereview.chromium.org/1397001

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@42764 0039d316-1c4b-4281-b951-d872f2087c98

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