Includes chrome_frame project in chrome.sln for windows.

BUG=None
TEST=rebuild gyp files, open chrome.sln. Observer chrome_frame project.

Review URL: http://codereview.chromium.org/271014

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@28362 0039d316-1c4b-4281-b951-d872f2087c98