POSIX: re-enable strict aliasing

chrome/renderer/extensions/scoped_persistent.h

 // Copyright 2013 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.
 
 #ifndef CHROME_RENDERER_EXTENSIONS_SCOPED_PERSISTENT_H_
 #define CHROME_RENDERER_EXTENSIONS_SCOPED_PERSISTENT_H_
 
 #include "base/logging.h"
 #include "v8/include/v8.h"
 
@@ skipping 29 matching lines @@
     handle_.Clear();
   }
 
   v8::Handle<T> operator->() const {
     return get();
   }
 
   // TODO(dcarney): Remove this function
   // This is an unsafe access to the underlying handle
   v8::Handle<T> get() const {
-    return *reinterpret_cast<v8::Handle<T>*>(
-      const_cast<v8::Persistent<T>* >(&handle_));
+    return bit_cast<v8::Handle<T> >(handle_);
   }
 
   v8::Handle<T> NewHandle() const {
     if (handle_.IsEmpty())
       return v8::Local<T>();
     return v8::Local<T>::New(GetIsolate(handle_), handle_);
   }
 
   template<typename P>
   void MakeWeak(P* parameters,
@@ skipping 21 matching lines @@
   }
 
   v8::Persistent<T> handle_;
 
   DISALLOW_COPY_AND_ASSIGN(ScopedPersistent);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_RENDERER_EXTENSIONS_SCOPED_PERSISTENT_H_