Remove forward declarations of unused ImageRepGdk and ImageRepCairo

Remove forward declarations of unused ImageRepGdk and ImageRepCairo

BUG=None
TEST=None
TBR=rsesek

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=272837

[pkotwicz, 2014-05-25 19:10:07]

The CQ bit was checked by pkotwicz@chromium.org

[commit-bot: I haz the power, 2014-05-25 19:10:18]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/pkotwicz@chromium.org/304443002/1

[commit-bot: I haz the power, 2014-05-25 21:01:30]

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, 2014-05-25 21:23:55]

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

[commit-bot: I haz the power, 2014-05-25 21:23:55]

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

[pkotwicz, 2014-05-26 01:09:28]

The CQ bit was checked by pkotwicz@chromium.org

[commit-bot: I haz the power, 2014-05-26 01:10:08]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/pkotwicz@chromium.org/304443002/1

[commit-bot: I haz the power, 2014-05-26 16:08:50]

Change committed as 272837

[Robert Sesek, 2014-05-27 13:42:01]

lgtm