Remove "Search Google for this image" context menu item for <webview>.

Remove "Search Google for this image" context menu item for <webview>.

The functionality was always broken, so remove it until it gets fixed.
We already do not show Searh google for * keyword item anyway.

BUG=407897
Test=In a chrome app, open a <webview> that loads an image.
Right click on that image.
"Search Google for this image" context menu item shouldn't appear.

Committed: https://crrev.com/e19acc3f5cbe6b8fe48bf2505e142a11bc988d0d
Cr-Commit-Position: refs/heads/master@{#292749}

[lazyboy, 2014-08-29 22:51:34]

lazyboy@chromium.org changed reviewers:
+ fsamuel@chromium.org

[Fady Samuel, 2014-08-29 23:11:24]

lgtm

[lazyboy, 2014-08-29 23:13:24]

The CQ bit was checked by lazyboy@chromium.org

[commit-bot: I haz the power, 2014-08-29 23:15:11]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/lazyboy@chromium.org/523023003/1

[commit-bot: I haz the power, 2014-08-30 01:04:56]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  linux_chromium_rel_swarming on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)

[commit-bot: I haz the power, 2014-08-30 01:38:34]

Committed patchset #1 (id:1) as 42d7bd6b91bfb949a58534ef608464f9d753e86b

[commit-bot: I haz the power, 2014-09-10 03:12:54]

Patchset 1 (id:??) landed as
https://crrev.com/e19acc3f5cbe6b8fe48bf2505e142a11bc988d0d
Cr-Commit-Position: refs/heads/master@{#292749}