Fix a bug where we were getting a resize cursor near the top of the web contents area.
Fix a bug where we were getting a resize cursor near the top of the web
contents area.

Fix a bug where the background color was not updated on theme change.

BUG=14956

Review URL: http://codereview.chromium.org/151063


git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@19599 0039d316-1c4b-4281-b951-d872f2087c98

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