Don't enable DWM rendering policy on Windows with custom frames.

This typically happens when we install a theme. Setting the DWM rendering policy on such
windows appears to confuse DWM, leading to the frame painting black when we switch back
to the default frame.

This problem only happens on Windows Vista + (Aero).

The other change is to call the HWNDMessageHandler::UpdateDwmNcRenderingPolicy function
from the HWNDMessageHandler::FrameTypeChanged function as before. This is to ensure that
we set DWM policy when the frame type changes.

BUG=342664
R=benwells@chromium.org, sky@chromium.org

Review URL: https://codereview.chromium.org/174103004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@252619 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 252619
DevTools: fix flex style in inspect.css

BUG=345587

Review URL: https://codereview.chromium.org/173493003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@252620 0039d316-1c4b-4281-b951-d872f2087c98
Reset the transform to identity after minimize animation is completed.

Remove rotation code which is not used.

BUG=none

Review URL: https://codereview.chromium.org/174473002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@252621 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 252621