Remove deprecated extension notifications from ApiResourceManager

Remove deprecated extension notifications from ApiResourceManager.

And Move api_resource_manager_unittest.cc to extensions_unittests to pass the unittest.(by using ExtensionsTest)

BUG=397164, 354046
TEST=extensions_unittests

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=287485

[limasdf, 2014-08-02 16:20:14]

PTAL.

Lei, for /chrome
Yoyo, for /extensions

CC James, just want to let you know that I'm moving
api_resource_manager_unittest.cc

[Lei Zhang, 2014-08-02 16:49:05]

chrome/chrome_tests_unit.gypi lgtm

[Yoyo Zhou, 2014-08-04 19:01:53]

LGTM

[limasdf, 2014-08-05 00:10:46]

The CQ bit was checked by limasdf@gmail.com

[commit-bot: I haz the power, 2014-08-05 00:13:31]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/limasdf@gmail.com/431023003/40001

[commit-bot: I haz the power, 2014-08-05 04:10:24]

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_...)

[limasdf, 2014-08-05 04:11:25]

The CQ bit was unchecked by limasdf@gmail.com

[limasdf, 2014-08-05 04:51:49]

The CQ bit was checked by limasdf@gmail.com

[commit-bot: I haz the power, 2014-08-05 04:52:39]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/limasdf@gmail.com/431023003/40001

[commit-bot: I haz the power, 2014-08-05 06:50:46]

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, 2014-08-05 07:53:41]

Change committed as 287485