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I chose to use the local ContentView class to implement BubbleDelegateView.
SpeechInputBubbleImpl didn't fit well as a BubbleDelegateView, because:
-Instances are expected to outlive Widget closure or hide (not implemented).
-SpeechInputBubbleBase::Show would cause a naming conflict.
-SpeechInputBubbleController interactions made that approach difficult.

BUG=98323
TEST=SpeechInputBubbles function as before.

Review URL: http://codereview.chromium.org/8565003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@110622 0039d316-1c4b-4281-b951-d872f2087c98