Revert 114003 - WebKit roll to r102559

This roll caused build breaks on Mac, Linux, and "Linux x64".
  http://build.chromium.org/p/chromium/builders/Mac/builds/9896/steps/compile/logs/stdio
  http://build.chromium.org/p/chromium/builders/Linux/builds/18264/steps/compile/logs/stdio
  http://build.chromium.org/p/chromium/builders/Linux%20x64/builds/19561/steps/compile/logs/stdio

BUG=None
TEST=Trybots
TBR=kbr

Review URL: http://codereview.chromium.org/8918002

TBR=bashi@chromium.org
Review URL: http://codereview.chromium.org/8921004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@114007 0039d316-1c4b-4281-b951-d872f2087c98

DEPS

@@ -5,7 +5,7 @@ vars = {
   "sourceforge_url": "http://%(repo)s.svn.sourceforge.net/svnroot/%(repo)s",
   "webkit_trunk": "http://svn.webkit.org/repository/webkit/trunk",
   "nacl_trunk": "http://src.chromium.org/native_client/trunk",
-  "webkit_revision": "102559",
+  "webkit_revision": "102542",
   "chromium_git": "http://git.chromium.org/git",
   "swig_revision": "69281",
   "nacl_revision": "7388",