linux: Constrain popup window size correctly.

Fixes a regression that I introduced while refactoring some
code in r74534.  We were limiting the size passed to GTK+ for
very large popup windows but storing the unconstrained size
internally.

BUG=72910
TEST=manual with test case from bug

Review URL: http://codereview.chromium.org/6469097

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@75673 0039d316-1c4b-4281-b951-d872f2087c98
1 file changed