Attempt to fix a chrome frame crash seen in the stable channel build 9.0.597.84. The crash occurs when the external tab container instance is being torn down which takes down the rootview which attempts to destroy child views leading to a crash while accessing a deleted focusmanager instance.
Attempt to fix a chrome frame crash seen in the stable channel build 9.0.597.84. The crash
occurs when the external tab container instance is being torn down which takes down the rootview
which attempts to destroy child views leading to a crash while accessing a deleted focusmanager
instance.

Proposed fix is to destroy the root child views in the TAB_CONTENTS_DESTROYED notification
which is sent out in the destructor of the TabContents object.

BUG=72356
TEST=none

Review URL: http://codereview.chromium.org/6463032

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@74388 0039d316-1c4b-4281-b951-d872f2087c98

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