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Fix extension icons showing up with incorrect size on Chrome HiDPI Windows with scales of 150% and above.

The extension sources associated with icons were using the ui::GetImageScale function which returns the dpi scale
on Windows HiDPI. Fix is to use the GetScaleForScaleFactor function instead.

BUG=375461
R=oshima

Review URL: https://codereview.chromium.org/297763004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@271856 0039d316-1c4b-4281-b951-d872f2087c98