[Device Service] Move Gamepad Blink headers to be part of the Gamepad client library

device/gamepad/gamepad_shared_buffer.cc

Index: device/gamepad/gamepad_shared_buffer.cc
diff --git a/device/gamepad/gamepad_shared_buffer.cc b/device/gamepad/gamepad_shared_buffer.cc
index 66ada779f1ed0e214efa2cd301ecb897860bec92..a8c2216110c6a5810fd8e9b922f51daf04dc401b 100644
--- a/device/gamepad/gamepad_shared_buffer.cc
+++ b/device/gamepad/gamepad_shared_buffer.cc
@@ -14,7 +14,7 @@ GamepadSharedBuffer::GamepadSharedBuffer() {
   void* mem = shared_memory_.memory();
   DCHECK(mem);
   hardware_buffer_ = new (mem) GamepadHardwareBuffer();
-  memset(&(hardware_buffer_->data), 0, sizeof(blink::WebGamepads));
+  memset(&(hardware_buffer_->data), 0, sizeof(Gamepads));
 }
 
 GamepadSharedBuffer::~GamepadSharedBuffer() {}
@@ -23,7 +23,7 @@ base::SharedMemory* GamepadSharedBuffer::shared_memory() {
   return &shared_memory_;
 }
 
-blink::WebGamepads* GamepadSharedBuffer::buffer() {
+Gamepads* GamepadSharedBuffer::buffer() {
   return &(hardware_buffer()->data);
 }