Use new is*Element() helper functions more in web/ code

public/platform/WebPrivatePtr.h

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 215 matching lines @@
 
     template<typename U>
     WebPrivatePtr<T>& operator=(const U& ptr)
     {
         storage().assign(ptr);
         return *this;
     }
 
     T* get() const { return storage().get(); }
 
+    T& operator*() const { ASSERT(get()); return *get(); }

[tkent, 2014/03/16 23:45:51]

We don't write multiple statements in a single line.  Please follow the format
of operator-> below.

[Inactive, 2014/03/16 23:53:51]

Done.

+
     T* operator->() const
     {
         ASSERT(m_storage);
         return get();
     }
 #endif
 
 private:
 #if INSIDE_BLINK
     PtrStorage<T>& storage() { return PtrStorage<T>::fromSlot(&m_storage); }
@@ skipping 10 matching lines @@
     // Disable the copy constructor; classes that contain a WebPrivatePtr
     // should implement their copy constructor using assign().
     WebPrivatePtr(const WebPrivatePtr<T>&);
 
     void* m_storage;
 };
 
 } // namespace blink
 
 #endif