Const correctness for some immutable members in BrowserPlugin.

content/renderer/browser_plugin/browser_plugin.h

Index: content/renderer/browser_plugin/browser_plugin.h
diff --git a/content/renderer/browser_plugin/browser_plugin.h b/content/renderer/browser_plugin/browser_plugin.h
index d17615441cb51657aef336caaade7ccbdde052fe..e7fed85a8c5734d06d9e4d75bbea94d3308e5ee4 100644
--- a/content/renderer/browser_plugin/browser_plugin.h
+++ b/content/renderer/browser_plugin/browser_plugin.h
@@ -285,11 +285,11 @@ class CONTENT_EXPORT BrowserPlugin :
   // This indicates whether this BrowserPlugin has been attached to a
   // WebContents.
   bool attached_;
-  base::WeakPtr<RenderViewImpl> render_view_;
+  const base::WeakPtr<RenderViewImpl> render_view_;
   // We cache the |render_view_|'s routing ID because we need it on destruction.
   // If the |render_view_| is destroyed before the BrowserPlugin is destroyed
   // then we will attempt to access a NULL pointer.
-  int render_view_routing_id_;
+  const int render_view_routing_id_;
   blink::WebPluginContainer* container_;
   scoped_ptr<BrowserPluginBindings> bindings_;
   bool paint_ack_received_;
@@ -311,7 +311,7 @@ class CONTENT_EXPORT BrowserPlugin :
   // embedder RenderView's visibility.
   bool visible_;
 
-  bool auto_navigate_;
+  const bool auto_navigate_;
   std::string html_string_;
 
   WebCursor cursor_;
@@ -323,7 +323,7 @@ class CONTENT_EXPORT BrowserPlugin :
   // BrowserPlugin outlives RenderViewImpl in Chrome Apps and so we need to
   // store the BrowserPlugin's BrowserPluginManager in a member variable to
   // avoid accessing the RenderViewImpl.
-  scoped_refptr<BrowserPluginManager> browser_plugin_manager_;
+  const scoped_refptr<BrowserPluginManager> browser_plugin_manager_;
 
   // Used for HW compositing.
   scoped_refptr<ChildFrameCompositingHelper> compositing_helper_;
@@ -332,7 +332,7 @@ class CONTENT_EXPORT BrowserPlugin :
   scoped_ptr<struct _NPP> npp_;
 
   // URL for the embedder frame.
-  GURL embedder_frame_url_;
+  const GURL embedder_frame_url_;
 
   std::vector<EditCommand> edit_commands_;