Let generate_trace_viewer_grd.py no generate a .rc file.

The only reference to this .rc file was removed in
https://chromiumcodereview.appspot.com/23543010 .

BUG=297672

Review URL: https://codereview.chromium.org/125413002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@243260 0039d316-1c4b-4281-b951-d872f2087c98
Revert "Retain tray bubble's rounded corners when the bubble animates out"

This reverts commit 7b1cac3592db1009adf4e11c2d9f87a81626630f.

BUG=330744, 330745, 331852
TBR=piman@chromium.org, msw@chromium.org

Review URL: https://codereview.chromium.org/125433002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@243261 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 243261