Fix BrowserActionButton's hover state in ToolbarController

Fix BrowserActionButton's hover state in ToolbarController.
The cell was changed from GradientButtonCell to ImageButtonCell. GradientButtonCell 
has setMouseInside:animate:, but for ImageButtonCell this method is called setIsMouseInside:

BUG=373662
R=thakis@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=273183

[Xuefei Ren, 2014-05-20 06:13:21]

bug=373662
Sorry for the style, this is my patch here.

[Nico, 2014-05-21 19:17:02]

lgtm, thanks!

(A slightly more detailed description would've been nice, something like "the
cell was changed from GradientButtonCell to ImageButtonCell. GradientButtonCell
has setMouseInside:animate:, but for ImageButtonCell this method is called
setIsMouseInside:")

[Nico, 2014-05-21 19:17:20]

(You can hit the "Commit" checkbox to land this.)

[Xuefei Ren, 2014-05-22 01:14:13]

The CQ bit was checked by xrenishere@gmail.com

[commit-bot: I haz the power, 2014-05-22 01:17:27]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/xrenishere@gmail.com/299633002/1

[Xuefei Ren, 2014-05-22 07:00:53]

The CQ bit was unchecked by xrenishere@gmail.com

[Xuefei Ren, 2014-05-27 09:10:42]

The CQ bit was checked by xrenishere@gmail.com

[commit-bot: I haz the power, 2014-05-27 09:11:17]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/xrenishere@gmail.com/299633002/10001

[commit-bot: I haz the power, 2014-05-27 12:16:53]

FYI, CQ is re-trying this CL (attempt #1).
Please consider checking whether the failures are real,
and report flakes to chrome-troopers@google.com.
The failing builders are:
  android_aosp on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/android_aosp/builds/7...)

[commit-bot: I haz the power, 2014-05-27 12:42:05]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-05-27 12:42:06]

Try jobs failed on following builders:
  android_aosp on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/android_aosp/builds/7...)

[Xuefei Ren, 2014-05-28 02:12:31]

The CQ bit was checked by xrenishere@gmail.com

[commit-bot: I haz the power, 2014-05-28 02:13:49]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/xrenishere@gmail.com/299633002/10001

[commit-bot: I haz the power, 2014-05-28 02:45:26]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  android_aosp on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/android_aosp/builds/7...)

[commit-bot: I haz the power, 2014-05-28 03:17:48]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-05-28 03:17:49]

Try jobs failed on following builders:
  android_aosp on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/android_aosp/builds/7...)

[Xuefei Ren, 2014-05-28 03:19:05]

The CQ bit was unchecked by xrenishere@gmail.com

[Xuefei Ren, 2014-05-28 03:23:34]

The CQ bit was checked by xrenishere@gmail.com

[commit-bot: I haz the power, 2014-05-28 03:24:16]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/xrenishere@gmail.com/299633002/30001

[Xuefei Ren, 2014-05-28 08:17:47]

The CQ bit was unchecked by xrenishere@gmail.com

[Xuefei Ren, 2014-05-28 08:18:00]

The CQ bit was checked by xrenishere@gmail.com

[commit-bot: I haz the power, 2014-05-28 08:18:40]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/xrenishere@gmail.com/299633002/30001

[commit-bot: I haz the power, 2014-05-28 08:46:59]

Change committed as 273183