Revert 284819 because it introduces leaks in TestingBoundaries and

Revert 284819 because it introduces leaks in TestingBoundaries and
EnterSlideGestureState tests in TouchExplorationTest:

Direct leak of 24 byte(s) in 1 object(s) allocated from:
    #0 0x448b2b in operator new(unsigned long) /usr/local/google/work/chromium/src/third_party/llvm/projects/compiler-rt/lib/asan/asan_new_delete.cc:55
    #1 0x14703f7 in ui::GestureProviderAura::GetAndResetPendingGestures() ui/events/gestures/gesture_provider_aura.cc:112
    #2 0x9f4986 in ui::TouchExplorationController::InSlideGesture(ui::TouchEvent const&, scoped_ptr\u003Cui::Event, base::DefaultDeleter\u003Cui::Event> >*) ui/chromeos/touch_exploration_controller.cc:578
    ...

etc.

> Added side slide gestures to touch exploration controller.
> 
> The user can control settings that might be normally changed using sliders by sliding along the edge of the screen when ChromeVox is on. For example, the user can slide along the right edge of the screen and adjust the volume.
> 
> If the user enters this mode and leaves the boundaries without releasing their touch, they will stop adjusting the setting, however, they will not enter touch exploration. If they return to the given boundaries, they will be able to modify the setting again. If the user does not touch a "hot edge" of the screen, they will not enter this state if they move to the an of the screen. 
> 
> BUG=393326
> 
> Review URL: https://codereview.chromium.org/385073009

TBR=lisayin@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=284849

[sadrul, 2014-07-23 04:30:55]

Committed patchset #1 manually as r284849 (tree was closed).