Removed use of RefPtr::Release where result is not used.

third_party/WebKit/Source/platform/wtf/RefPtr.h

 /*
  *  Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2013 Apple Inc.
  *  All rights reserved.
  *
  *  This library is free software; you can redistribute it and/or
  *  modify it under the terms of the GNU Library General Public
  *  License as published by the Free Software Foundation; either
  *  version 2 of the License, or (at your option) any later version.
  *
  *  This library is distributed in the hope that it will be useful,
@@ skipping 52 matching lines @@
   RefPtr(HashTableDeletedValueType) : ptr_(HashTableDeletedValue()) {}
   bool IsHashTableDeletedValue() const {
     return ptr_ == HashTableDeletedValue();
   }
 
   ALWAYS_INLINE ~RefPtr() { DerefIfNotNull(ptr_); }
 
   ALWAYS_INLINE T* Get() const { return ptr_; }
   T* LeakRef() WARN_UNUSED_RESULT;
   void Clear();
-  PassRefPtr<T> Release() {
+  PassRefPtr<T> Release() WARN_UNUSED_RESULT {
     PassRefPtr<T> tmp = AdoptRef(ptr_);
     ptr_ = nullptr;
     return tmp;
   }
 
   T& operator*() const { return *ptr_; }
   ALWAYS_INLINE T* operator->() const { return ptr_; }
 
   bool operator!() const { return !ptr_; }
   explicit operator bool() const { return ptr_ != nullptr; }
@@ skipping 126 matching lines @@
 
  private:
   T* ptr_;
 };
 
 }  // namespace WTF
 
 using WTF::RefPtr;
 
 #endif  // WTF_RefPtr_h