Use ExtensionRegistryObserver instead of DEPRECATED extension notify from app_window_geometry_cache

Use ExtensionRegistryObserver instead of DEPRECATED extension notify from app_window_geometry_cache

BUG=354046
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=269523

[limasdf, 2014-05-07 16:30:54]

one day one fix-_-;; 
I hope this doens't bother you

ptal

[not at google - send to devlin, 2014-05-07 16:36:41]

lgtm

these never bother me!

[limasdf, 2014-05-07 16:41:51]

The CQ bit was checked by limasdf@gmail.com

[commit-bot: I haz the power, 2014-05-07 16:42:48]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/limasdf@gmail.com/270703003/20001

[limasdf, 2014-05-07 18:11:58]

The CQ bit was unchecked by limasdf@gmail.com

[limasdf, 2014-05-09 04:03:14]

The CQ bit was checked by limasdf@gmail.com

[commit-bot: I haz the power, 2014-05-09 04:06:15]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/limasdf@gmail.com/270703003/40001

[commit-bot: I haz the power, 2014-05-09 06:07:55]

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_clang_dbg on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/android_clang_dbg/bui...)
  android_dbg_triggered_tests on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/android_dbg_triggered...)
  chromium_presubmit on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/chromium_presubmit/bu...)
  ios_dbg_simulator on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/ios_dbg_simulator/bui...)
  ios_rel_device on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/ios_rel_device/builds...)
  ios_rel_device_ninja on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/ios_rel_device_ninja/...)
  linux_chromium_clang_dbg on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/linux_chromium_clang_...)
  linux_chromium_rel on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/linux_chromium_rel/bu...)
  mac_chromium_compile_dbg on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/mac_chromium_compile_...)
  mac_chromium_rel on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/mac_chromium_rel/buil...)
  win_chromium_compile_dbg on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/win_chromium_compile_...)
  win_chromium_rel on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/win_chromium_rel/buil...)
  win_chromium_x64_rel on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/win_chromium_x64_rel/...)

[commit-bot: I haz the power, 2014-05-09 06:41:59]

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

[commit-bot: I haz the power, 2014-05-09 06:42:00]

Try jobs failed on following builders:
  win_chromium_x64_rel on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/win_chromium_x64_rel/...)

[limasdf, 2014-05-09 07:00:54]

The CQ bit was checked by limasdf@gmail.com

[commit-bot: I haz the power, 2014-05-09 07:09:01]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/limasdf@gmail.com/270703003/40001

[commit-bot: I haz the power, 2014-05-10 04:40:01]

Change committed as 269523