mash: Migrate [Keyboard]Brightness code to ash/common.

ash/shell.cc

Index: ash/shell.cc
diff --git a/ash/shell.cc b/ash/shell.cc
index 3183c7ad8f3811ba7e932c3d7ea78e5c49e05b5e..1d95130943f3341557d3af53896bb869dac1ee85 100644
--- a/ash/shell.cc
+++ b/ash/shell.cc
@@ -126,6 +126,7 @@
 #include "ash/accelerators/spoken_feedback_toggler.h"
 #include "ash/common/ash_constants.h"
 #include "ash/common/system/chromeos/bluetooth/bluetooth_notification_controller.h"
+#include "ash/common/system/chromeos/brightness/brightness_controller_chromeos.h"
 #include "ash/common/system/chromeos/power/power_status.h"
 #include "ash/display/display_change_observer_chromeos.h"
 #include "ash/display/display_color_manager_chromeos.h"
@@ -134,7 +135,6 @@
 #include "ash/display/resolution_notification_controller.h"
 #include "ash/display/screen_orientation_controller_chromeos.h"
 #include "ash/sticky_keys/sticky_keys_controller.h"
-#include "ash/system/chromeos/brightness/brightness_controller_chromeos.h"
 #include "ash/system/chromeos/power/power_event_observer.h"
 #include "ash/system/chromeos/power/video_activity_notifier.h"
 #include "ash/touch/touch_transformer_controller.h"
@@ -1073,10 +1073,8 @@ void Shell::Init(const ShellInitParams& init_params) {
   }
 
 #if defined(OS_CHROMEOS)
-  // Set accelerator controller delegates.
-  accelerator_controller_->SetBrightnessControlDelegate(
-      std::unique_ptr<BrightnessControlDelegate>(
-          new system::BrightnessControllerChromeos));
+  WmShell::Get()->SetBrightnessControlDelegate(

[msw, 2016/07/07 22:41:59]

I could move this to WmShell's ctor or similar; wdyt?

[James Cook, 2016/07/07 23:08:49]

I would try moving it to WmShell ctor. If that works, it's what I would prefer.

[msw, 2016/07/08 01:40:48]

Done.

+      base::WrapUnique(new system::BrightnessControllerChromeos));
 
   power_event_observer_.reset(new PowerEventObserver());
   user_activity_notifier_.reset(