Scope and clean up uses of AccessibilityMode.

content/common/content_param_traits.h

Index: content/common/content_param_traits.h
diff --git a/content/common/content_param_traits.h b/content/common/content_param_traits.h
index c20b75d1b8abae96f96ba24b020730b8268afc5a..640207ca8bc6c47c55360042e84a936333a139d2 100644
--- a/content/common/content_param_traits.h
+++ b/content/common/content_param_traits.h
@@ -19,6 +19,7 @@
 #include "third_party/WebKit/public/platform/WebInputEvent.h"
 
 namespace content {
+class AccessibilityMode;
 class MessagePort;
 }
 
@@ -61,6 +62,17 @@ struct CONTENT_EXPORT ParamTraits<content::MessagePort> {
   static void Log(const param_type& p, std::string* l);
 };
 
+template <>
+struct CONTENT_EXPORT ParamTraits<content::AccessibilityMode> {
+  typedef content::AccessibilityMode param_type;
+  static void GetSize(base::PickleSizer* sizer, const param_type& p);
+  static void Write(base::Pickle* m, const param_type& p);
+  static bool Read(const base::Pickle* m,
+                   base::PickleIterator* iter,
+                   param_type* r);
+  static void Log(const param_type& p, std::string* l);
+};
+
 }  // namespace IPC
 
 #endif  // CONTENT_COMMON_CONTENT_PARAM_TRAITS_H_