[MacViews] Remove stray/unguarded uses of ui/aura/window.h in cross-platform files

[MacViews] Remove stray/unguarded uses of ui/aura/window.h in cross-platform files

The window.h header compiles on Mac, but its implementation isn't linked
in, resulting in errors later. This CL was made by putting an #error in
aura/window.h.

Some of these #includes were simply redundant/unused.

tab_drag_controller.cc changed recently in r321128 and relies on
aura/window.h to implicitly cast an aura::Window to a
ui::GestureConsumer.

BUG=425229
Committed: https://crrev.com/3b74b439c3c1c102023a2dc92184ea02f38849cd
Cr-Commit-Position: refs/heads/master@{#323535}

[tapted, 2015-04-02 06:55:49]

tapted@chromium.org changed reviewers:
+ sky@chromium.org

[tapted, 2015-04-02 10:38:22]

Hi sky, please take a look

https://codereview.chromium.org/1050353002/diff/100001/chrome/browser/ui/view...
File chrome/browser/ui/views/tabs/tab_drag_controller.cc (right):

https://codereview.chromium.org/1050353002/diff/100001/chrome/browser/ui/view...
chrome/browser/ui/views/tabs/tab_drag_controller.cc:595: #endif
note that before r321128 these were #ifdef OS_WIN

[sky, 2015-04-02 17:21:38]

LGTM

[Andre, 2015-04-02 17:24:21]

The CQ bit was checked by andresantoso@chromium.org

[commit-bot: I haz the power, 2015-04-02 17:24:50]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1050353002/100001

[commit-bot: I haz the power, 2015-04-02 17:43:48]

Committed patchset #6 (id:100001)

[commit-bot: I haz the power, 2015-04-03 20:27:42]

Patchset 6 (id:??) landed as
https://crrev.com/3b74b439c3c1c102023a2dc92184ea02f38849cd
Cr-Commit-Position: refs/heads/master@{#323535}