Movw GamepadService out of content/browser/ and into device/

device/gamepad/BUILD.gn

Index: device/gamepad/BUILD.gn
diff --git a/device/gamepad/BUILD.gn b/device/gamepad/BUILD.gn
index 92cc1d34e31ae5e0d0c60de2799832ba882cc798..587ad670d8719acad166d7aee247f6d07e79c5c0 100644
--- a/device/gamepad/BUILD.gn
+++ b/device/gamepad/BUILD.gn
@@ -3,6 +3,7 @@
 # found in the LICENSE file.
 
 import("//build/config/features.gni")
+import("//mojo/public/tools/bindings/mojom.gni")
 
 if (is_android) {
   import("//build/config/android/config.gni")
@@ -36,6 +37,10 @@ component("gamepad") {
     "gamepad_platform_data_fetcher_win.h",
     "gamepad_provider.cc",
     "gamepad_provider.h",
+    "gamepad_service.cc",
+    "gamepad_service.h",
+    "gamepad_shared_buffer.cc",
+    "gamepad_shared_buffer.h",
     "gamepad_standard_mappings.cc",
     "gamepad_standard_mappings.h",
     "gamepad_standard_mappings_linux.cc",
@@ -52,6 +57,7 @@ component("gamepad") {
   deps = [
     "//base",
     "//base/third_party/dynamic_annotations",
+    "//device/base/synchronization",
     "//third_party/WebKit/public:blink_headers",
   ]