Update webkit to 65740.

BUG=none
TEST=none
TBR=rolandsteiner

Review URL: http://codereview.chromium.org/3131030

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@56903 0039d316-1c4b-4281-b951-d872f2087c98

DEPS

 vars = {
   "webkit_trunk": "http://svn.webkit.org/repository/webkit/trunk",
   "nacl_trunk": "http://nativeclient.googlecode.com/svn/trunk",
-  "webkit_revision": "65726",
+  "webkit_revision": "65740",
   "ffmpeg_revision": "56386",
   "skia_revision": "593",
   "chromium_git": "http://src.chromium.org/git",