Add a browsertest for bug 75604

This browser test tickles the webkit bug described in crbug.com/75604 .
The bug is very hard to repliably reproduce in a layout test, so my plan is
to land this browser_test, update webkit to fix the bug, and update this
test as we garden past the fix.

BUG=75604

Review URL: http://codereview.chromium.org/8404001

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@107949 0039d316-1c4b-4281-b951-d872f2087c98
6 files changed