Reenable the ResourceBundleImageTest.GetImageNamed test for Windows.

The test was failing due to the change to load 200 px resources for Windows for high dpi
support. Reason being the test expected that the scale factor for images on platforms other
than Chrome OS was 100 px which is not the case anymore.

Updated the test to have similar expectations on Windows.

BUG=349607
R=sky@chromium.org
TBR=sky

Review URL: https://codereview.chromium.org/193713003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@256278 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 256278