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

device/vr/android/gvr/gvr_gamepad_data_fetcher.cc

Index: device/vr/android/gvr/gvr_gamepad_data_fetcher.cc
diff --git a/device/vr/android/gvr/gvr_gamepad_data_fetcher.cc b/device/vr/android/gvr/gvr_gamepad_data_fetcher.cc
index a18b6c6cae3382e2d50b27534d4a2b341470b765..1f0cedbb4fff76df5063a15198e1f95db27cd394 100644
--- a/device/vr/android/gvr/gvr_gamepad_data_fetcher.cc
+++ b/device/vr/android/gvr/gvr_gamepad_data_fetcher.cc
@@ -6,18 +6,16 @@
 
 #include "base/memory/ptr_util.h"
 #include "base/strings/utf_string_conversions.h"
+#include "device/gamepad/public/cpp/gamepads.h"
 #include "device/vr/android/gvr/gvr_gamepad_data_provider.h"
 #include "device/vr/vr_types.h"
-#include "third_party/WebKit/public/platform/WebGamepads.h"
 
 namespace device {
 
 namespace {
 
-void CopyToWebUString(blink::WebUChar* dest,
-                      size_t dest_length,
-                      base::string16 src) {
-  static_assert(sizeof(base::string16::value_type) == sizeof(blink::WebUChar),
+void CopyToUString(UChar* dest, size_t dest_length, base::string16 src) {
+  static_assert(sizeof(base::string16::value_type) == sizeof(UChar),
                 "Mismatched string16/WebUChar size.");
 
   const size_t str_to_copy = std::min(src.size(), dest_length - 1);
@@ -27,8 +25,6 @@ void CopyToWebUString(blink::WebUChar* dest,
 
 }  // namespace
 
-using namespace blink;
-
 GvrGamepadDataFetcher::Factory::Factory(GvrGamepadDataProvider* data_provider,
                                         unsigned int display_id)
     : data_provider_(data_provider), display_id_(display_id) {
@@ -85,15 +81,15 @@ void GvrGamepadDataFetcher::GetGamepadData(bool devices_changed_hint) {
   // TODO(bajones): ensure consistency?
   GvrGamepadData provided_data = gamepad_data_;
 
-  WebGamepad& pad = state->data;
+  Gamepad& pad = state->data;
   if (state->active_state == GAMEPAD_NEWLY_ACTIVE) {
     // This is the first time we've seen this device, so do some one-time
     // initialization
     pad.connected = true;
-    CopyToWebUString(pad.id, WebGamepad::kIdLengthCap,
-                     base::UTF8ToUTF16("Daydream Controller"));
-    CopyToWebUString(pad.mapping, WebGamepad::kMappingLengthCap,
-                     base::UTF8ToUTF16(""));
+    CopyToUString(pad.id, Gamepad::kIdLengthCap,
+                  base::UTF8ToUTF16("Daydream Controller"));
+    CopyToUString(pad.mapping, Gamepad::kMappingLengthCap,
+                  base::UTF8ToUTF16(""));
     pad.buttons_length = 1;
     pad.axes_length = 2;