Convert Gamepad IPC messages into mojo interface.

content/browser/BUILD.gn

Index: content/browser/BUILD.gn
diff --git a/content/browser/BUILD.gn b/content/browser/BUILD.gn
index 78c2d6e3f43f67d1e5588509e5abdcf4f5d92707..473fba72b17973810b7360a5307a381dfe3f9025 100644
--- a/content/browser/BUILD.gn
+++ b/content/browser/BUILD.gn
@@ -70,6 +70,7 @@ source_set("browser") {
     "//device/battery:mojo_bindings",
     "//device/bluetooth",
     "//device/gamepad",
+    "//device/gamepad/public/interfaces",
     "//device/generic_sensor",
     "//device/geolocation",
     "//device/geolocation/public/interfaces",
@@ -1002,8 +1003,8 @@ source_set("browser") {
     "renderer_host/font_utils_linux.h",
     "renderer_host/frame_metadata_util.cc",
     "renderer_host/frame_metadata_util.h",
-    "renderer_host/gamepad_browser_message_filter.cc",
-    "renderer_host/gamepad_browser_message_filter.h",
+    "renderer_host/gamepad_monitor.cc",
+    "renderer_host/gamepad_monitor.h",
     "renderer_host/input/gesture_event_queue.cc",
     "renderer_host/input/gesture_event_queue.h",
     "renderer_host/input/input_ack_handler.h",