[chromoting] Custom scrollbar styling for webapp
[chromoting] Custom scrollbar styling for webapp

Custom styling for scrollbar and also avoid corruption in rendering
by having an opaque background for ::-webkit-scrollbar-track-piece.

This is mostly a revert of 9578004.

BUG=110023
TEST=chromoting webapp has scrollbar in lion


Review URL: http://codereview.chromium.org/9826038

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@128398 0039d316-1c4b-4281-b951-d872f2087c98

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