Replace Chrome IPC with Mojo IPC for querying BatteryStatus service

content/browser/mojo/mojo_application_host.h

Index: content/browser/mojo/mojo_application_host.h
diff --git a/content/browser/mojo/mojo_application_host.h b/content/browser/mojo/mojo_application_host.h
index 27a43f89c2dcd0db5c3df11a8d22fa046a3609c4..238525d6e43946aeb2ad4e6fdf1f4e7a3a606b79 100644
--- a/content/browser/mojo/mojo_application_host.h
+++ b/content/browser/mojo/mojo_application_host.h
@@ -30,12 +30,10 @@ class MojoApplicationHost {
   //  1- Init makes service_registry() available synchronously.
   //  2- Activate establishes the actual connection to the peer process.
   bool Init();
-  bool Activate(IPC::Sender* sender, base::ProcessHandle process_handle);
+  void Activate(IPC::Sender* sender, base::ProcessHandle process_handle);
 
   void WillDestroySoon();
 
-  bool did_activate() const { return did_activate_; }
-
   ServiceRegistry* service_registry() { return &service_registry_; }
 
  private: