Revert 202866 "Blink roll 151349:151373"

Caused WebViewInteractiveTest.PopupPositioningMoved to fail on Mac dbg 10.6 and 10.7:
WebViewInteractiveTest.PopupPositioningMoved: 
[1326:263:0529/075351:INFO:gpu_command_buffer_stub.cc(468)] Created virtual GL context.
/Volumes/data/b/build/third_party/zope/__init__.py:19: UserWarning: Module twisted was already imported from /Volumes/data/b/build/third_party/twisted_10_2/twisted/__init__.pyc, but /System/Library/Frameworks/Python.framework/Versions/2.6/Extras/lib/python is being added to sys.path
import pkg_resources
/Volumes/data/b/build/third_party/zope/__init__.py:19: UserWarning: Module zope was already imported from /Volumes/data/b/build/third_party/zope/__init__.pyc, but /System/Library/Frameworks/Python.framework/Versions/2.6/Extras/lib/python is being added to sys.path
import pkg_resources
HTTP server started on 127.0.0.1:49950...
sending server_data: {"host": "127.0.0.1", "port": 49950} (36 bytes)
[1325:263:0529/075353:219402889538:INFO:CONSOLE(431)] "chrome.webRequest is not available: You do not have permission to access this API. Ensure that the required permission or manifest property is included in your manifest.json.", source: binding (431)
[1325:263:0529/075353:220201666944:INFO:CONSOLE(431)] "chrome.webRequest is not available: You do not have permission to access this API. Ensure that the required permission or manifest property is included in your manifest.json.", source: binding (431)
[1326:263:0529/075354:INFO:gpu_command_buffer_stub.cc(468)] Created virtual GL context.
[1326:263:0529/075355:INFO:gpu_command_buffer_stub.cc(468)] Created virtual GL context.
[1326:263:0529/075355:INFO:gpu_command_buffer_stub.cc(468)] Created virtual GL context.
[1325:263:0529/075356:222219659574:INFO:CONSOLE(18)] "webview.loadstop", source: chrome-extension://nnkmmcedebpphammhapimbckejdabddg/main.js (18)
[1325:263:0529/075356:222325071892:INFO:CONSOLE(33)] "onInput, value: C, step = 1", source: http://localhost:49950/files/extensions/platform_apps/web_view/popup_positioning_moved/guest.html (33)
[1325:263:0529/075356:222831052658:INFO:web_view_interactive_browsertest.cc(227)] DIFF: x = 42, y = 86
../../chrome/browser/extensions/web_view_interactive_browsertest.cc:237: Failure
Expected: (std::abs(diff.x() - left_spacing)) <= (threshold_px), actual: 18 vs 10
[1325:263:0529/075356:222837065116:INFO:CONSOLE(33)] "onInput, value: Chromium, step = 2", source: http://localhost:49950/files/extensions/platform_apps/web_view/popup_positioning_moved/guest.html (33)

> Blink roll 151349:151373
> 
> http://build.chromium.org/f/chromium/perf/dashboard/ui/changelog_blink.html?url=/trunk&range=151350:151373&mode=html
> TBR=
> BUG=
> 
> Review URL: https://chromiumcodereview.appspot.com/16194003

TBR=eseidel@chromium.org

Review URL: https://codereview.chromium.org/15904014

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@202872 0039d316-1c4b-4281-b951-d872f2087c98

DEPS

@@ -8,7 +8,7 @@ vars = {
   "sourceforge_url": "http://%(repo)s.svn.sourceforge.net/svnroot/%(repo)s",
   "webkit_trunk": "http://src.chromium.org/blink/trunk",
   "nacl_trunk": "http://src.chromium.org/native_client/trunk",
-  "webkit_revision": "151373",
+  "webkit_revision": "151349",
   "chromium_git": "https://chromium.googlesource.com",
   "chromiumos_git": "https://chromium.googlesource.com/chromiumos",
   "swig_revision": "69281",