Add some const to content/.

content/browser/renderer_host/render_process_host_impl.h

 // Copyright (c) 2012 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 CONTENT_BROWSER_RENDERER_HOST_RENDER_PROCESS_HOST_IMPL_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_PROCESS_HOST_IMPL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 487 matching lines @@
 
   // The globally-unique identifier for this RPH.
   const int id_;
 
   // A secondary ID used by the Service Manager to distinguish different
   // incarnations of the same RPH from each other. Unlike |id_| this is not
   // globally unique, but it is guaranteed to change every time ProcessDied() is
   // called.
   int instance_id_ = 1;
 
-  BrowserContext* browser_context_;
+  BrowserContext* const browser_context_;
 
   // Owned by |browser_context_|.
   StoragePartitionImpl* storage_partition_impl_;
 
   // The observers watching our lifetime.
   base::ObserverList<RenderProcessHostObserver> observers_;
 
   // True if the process can be shut down suddenly.  If this is true, then we're
   // sure that all the RenderViews in the process can be shutdown suddenly.  If
   // it's false, then specific RenderViews might still be allowed to be shutdown
@@ skipping 91 matching lines @@
       instance_weak_factory_;
 
   base::WeakPtrFactory<RenderProcessHostImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderProcessHostImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_PROCESS_HOST_IMPL_H_