Move 4 UI components to FileManagerUI class from FileManager.

Move 4 UI components to FileManagerUI class from FileManager.

 * ProgressCenterPanel
 * DirectoryTree
 * GearButton
 * TaskItems (ComboButton)

BUG=267281
TEST=None

Committed: https://crrev.com/9291040409959e3c1f3e9e333660d25c40fdd968
Cr-Commit-Position: refs/heads/master@{#303626}

[hirono, 2014-11-10 11:02:28]

hirono@chromium.org changed reviewers:
+ fukino@chromium.org

[hirono, 2014-11-10 11:02:28]

PTAL the CL? Thank you!

[fukino, 2014-11-11 04:55:47]

On 2014/11/10 11:02:28, hirono wrote:
> PTAL the CL? Thank you!

lgtm!

[hirono, 2014-11-11 09:41:18]

On 2014/11/11 04:55:47, fukino wrote:
> On 2014/11/10 11:02:28, hirono wrote:
> > PTAL the CL? Thank you!
> 
> lgtm!

Thanks!

[hirono, 2014-11-11 09:41:19]

The CQ bit was checked by hirono@chromium.org

[hirono, 2014-11-11 09:41:22]

The CQ bit was checked by hirono@chromium.org

[commit-bot: I haz the power, 2014-11-11 09:41:47]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/708383003/40001

[commit-bot: I haz the power, 2014-11-11 09:45:13]

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

[commit-bot: I haz the power, 2014-11-11 09:45:14]

Try jobs failed on following builders:
  chromium_presubmit on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/chromium_presub...)
  linux_chromium_asan_rel on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)
  linux_chromium_compile_dbg_32 on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)
  win_chromium_rel on tryserver.chromium.win
(http://build.chromium.org/p/tryserver.chromium.win/builders/win_chromium_rel/...)
  win_chromium_x64_rel on tryserver.chromium.win
(http://build.chromium.org/p/tryserver.chromium.win/builders/win_chromium_x64_...)

[hirono, 2014-11-11 11:09:31]

The CQ bit was checked by hirono@chromium.org

[commit-bot: I haz the power, 2014-11-11 11:10:42]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/708383003/60001

[commit-bot: I haz the power, 2014-11-11 12:21:10]

Committed patchset #4 (id:60001)

[commit-bot: I haz the power, 2014-11-11 12:21:56]

Patchset 4 (id:??) landed as
https://crrev.com/9291040409959e3c1f3e9e333660d25c40fdd968
Cr-Commit-Position: refs/heads/master@{#303626}