[content/browser/media] Replace MessageLoopProxy usage with ThreadTaskRunnerHandle

content/browser/media/capture/web_contents_tracker.cc

Index: content/browser/media/capture/web_contents_tracker.cc
diff --git a/content/browser/media/capture/web_contents_tracker.cc b/content/browser/media/capture/web_contents_tracker.cc
index 6810ac097aac4b44ae976d439c1112d2ea611436..bd8ec2420ad69a4e098363e2500c16b77ad595ae 100644
--- a/content/browser/media/capture/web_contents_tracker.cc
+++ b/content/browser/media/capture/web_contents_tracker.cc
@@ -4,7 +4,7 @@
 
 #include "content/browser/media/capture/web_contents_tracker.h"
 
-#include "base/message_loop/message_loop_proxy.h"
+#include "base/thread_task_runner_handle.h"
 #include "content/browser/frame_host/render_frame_host_impl.h"
 #include "content/browser/renderer_host/render_widget_host_impl.h"
 #include "content/public/browser/browser_thread.h"
@@ -26,7 +26,7 @@ void WebContentsTracker::Start(int render_process_id, int main_render_frame_id,
                                const ChangeCallback& callback) {
   DCHECK(!message_loop_.get() || message_loop_->BelongsToCurrentThread());
 
-  message_loop_ = base::MessageLoopProxy::current();
+  message_loop_ = base::ThreadTaskRunnerHandle::Get();
   DCHECK(message_loop_.get());
   callback_ = callback;