Disable inverting web content when high-contrast mode is on.
Disable inverting web content when high-contrast mode is on.

Some users liked it, others hated it, others wanted to be able to toggle it.
This patch just disables the current behavior and should be merged to the
M19 branch, then I'll try a new approach in the trunk.

BUG=112944
TEST=none


Review URL: http://codereview.chromium.org/10146031

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@133473 0039d316-1c4b-4281-b951-d872f2087c98

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