Eliminate remaining WebCore dependencies from webplugin_impl.cc...

base/weak_ptr.h

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Weak pointers help in cases where you have many objects referring back to a
 // shared object and you wish for the lifetime of the shared object to not be
 // bound to the lifetime of the referrers.  In other words, this is useful when
 // reference counting is not a good fit.
 //
 // A common alternative to weak pointers is to have the shared object hold a
@@ skipping 143 matching lines @@
 
   T* operator*() const {
     DCHECK(get() != NULL);
     return *get();
   }
   T* operator->() const {
     DCHECK(get() != NULL);
     return get();
   }
 
+  void reset() {
+    ref_ = internal::WeakReference();
+    ptr_ = NULL;
+  }
+
  private:
   friend class SupportsWeakPtr<T>;
   friend class WeakPtrFactory<T>;
 
   WeakPtr(const internal::WeakReference& ref, T* ptr)
       : WeakPtrBase(ref), ptr_(ptr) {
   }
 
   // This pointer is only valid when ref_.is_valid() is true.  Otherwise, its
   // value is undefined (as opposed to NULL).
@@ skipping 38 matching lines @@
 
  private:
   internal::WeakReferenceOwner weak_reference_owner_;
   T* ptr_;
   DISALLOW_IMPLICIT_CONSTRUCTORS(WeakPtrFactory);
 };
 
 }  // namespace base
 
 #endif  // BASE_WEAK_PTR_H_