Remove old C++03 move emulation code.

content/child/scoped_web_callbacks.h

Index: content/child/scoped_web_callbacks.h
diff --git a/content/child/scoped_web_callbacks.h b/content/child/scoped_web_callbacks.h
index 7f578dda93f41a2eb9d6f7918694241ad5aa4d7d..0aa36bc4480ffe00cbe6c2ae5921aeae70573670 100644
--- a/content/child/scoped_web_callbacks.h
+++ b/content/child/scoped_web_callbacks.h
@@ -64,7 +64,7 @@
 // our desired default behavior before deleting the WebCallbacks.
 template <typename CallbacksType>
 class ScopedWebCallbacks {
-  MOVE_ONLY_TYPE_FOR_CPP_03(ScopedWebCallbacks, RValue);
+  MOVE_ONLY_TYPE_FOR_CPP_03(ScopedWebCallbacks);
 
  public:
   using DestructionCallback =
@@ -80,11 +80,11 @@ class ScopedWebCallbacks {
       destruction_callback_.Run(callbacks_.Pass());
   }
 
-  ScopedWebCallbacks(RValue other) { *this = other; }
+  ScopedWebCallbacks(ScopedWebCallbacks&& other) { *this = other.Pass(); }
 
-  ScopedWebCallbacks& operator=(RValue other) {
-    callbacks_ = other.object->callbacks_.Pass();
-    destruction_callback_ = other.object->destruction_callback_;
+  ScopedWebCallbacks& operator=(ScopedWebCallbacks&& other) {
+    callbacks_ = other.callbacks_.Pass();
+    destruction_callback_ = other.destruction_callback_;
     return *this;
   }