Move gamepad_service out of content/ and into device/

ppapi/shared_impl/ppb_gamepad_shared.h

Index: ppapi/shared_impl/ppb_gamepad_shared.h
diff --git a/ppapi/shared_impl/ppb_gamepad_shared.h b/ppapi/shared_impl/ppb_gamepad_shared.h
index 3a3d6802c09364d3a9f845d65e7ec6f747e63c62..4a71d9645502a4f223a5c8dd6de70f70fcbf5761 100644
--- a/ppapi/shared_impl/ppb_gamepad_shared.h
+++ b/ppapi/shared_impl/ppb_gamepad_shared.h
@@ -109,7 +109,7 @@ struct WebKitGamepads {
 };
 
 // This is the structure store in shared memory. It must match
-// content/common/gamepad_hardware_buffer.h. The GamepadHost unit test has
+// device::GamepadHardwareBuffer. The GamepadHost unit test has
 // some compile asserts to validate this.
 struct ContentGamepadHardwareBuffer {
   base::subtle::Atomic32 sequence;