Revert of Deletes mojo::Callback

content/browser/battery_status/battery_monitor_integration_browsertest.cc

Index: content/browser/battery_status/battery_monitor_integration_browsertest.cc
diff --git a/content/browser/battery_status/battery_monitor_integration_browsertest.cc b/content/browser/battery_status/battery_monitor_integration_browsertest.cc
index 5115c3f418de6458cf36e1f12285f7dc1b023006..92d9340703b0302834938a4dfe6d4de357746972 100644
--- a/content/browser/battery_status/battery_monitor_integration_browsertest.cc
+++ b/content/browser/battery_status/battery_monitor_integration_browsertest.cc
@@ -54,11 +54,13 @@
   }
 
  private:
+  typedef mojo::Callback<void(device::BatteryStatusPtr)> BatteryStatusCallback;
+
   FakeBatteryMonitor(mojo::InterfaceRequest<BatteryMonitor> request)
       : binding_(this, std::move(request)) {}
   ~FakeBatteryMonitor() override {}
 
-  void QueryNextStatus(const QueryNextStatusCallback& callback) override {
+  void QueryNextStatus(const BatteryStatusCallback& callback) override {
     // We don't expect overlapped calls to QueryNextStatus.
     DCHECK(callback_.is_null());
 
@@ -82,7 +84,7 @@
 
   std::unique_ptr<BatteryUpdateSubscription> subscription_;
   mojo::StrongBinding<BatteryMonitor> binding_;
-  QueryNextStatusCallback callback_;
+  BatteryStatusCallback callback_;
 };
 
 // Overrides the default service implementation with the test implementation