Hook up request interceptors in AndroidWebView code.

Hook up request interceptors in AndroidWebView code.

Request interceptors are the new way to handle intercepting URL
requests, to be used by ServiceWorkers and AppCache.  This CL
hooks them up to the URLRequestContext in AndroidWebview.

BUG=350286
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=274586

[mmenke, 2014-06-02 21:14:41]

This shouldn't have any immediate impact, but ServiceWorkers will be hooked up
this way, and I intend to get AppCache hooked up via this mechanism, too...Some
day.

[mkosiba (inactive), 2014-06-03 08:06:01]

lgtm

[pauljensen, 2014-06-03 10:45:26]

lgtm

[mmenke, 2014-06-03 12:41:43]

The CQ bit was checked by mmenke@chromium.org

[commit-bot: I haz the power, 2014-06-03 12:42:33]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/mmenke@chromium.org/294023015/60001

[commit-bot: I haz the power, 2014-06-03 16:40:02]

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

[commit-bot: I haz the power, 2014-06-03 19:13:36]

Change committed as 274586