base::RefCounted now DCHECKs when referenced from multiple threads.

content/public/common/resource_devtools_info.h

Index: content/public/common/resource_devtools_info.h
diff --git a/content/public/common/resource_devtools_info.h b/content/public/common/resource_devtools_info.h
index bf17b1b6a82546a6d9d83189e1e5c422dd5db650..1f7d48e6121c94105b3d01932317338ac1b6b062 100644
--- a/content/public/common/resource_devtools_info.h
+++ b/content/public/common/resource_devtools_info.h
@@ -17,7 +17,8 @@ namespace content {
 
 // Note: when modifying this structure, also update DeepCopy in
 // resource_devtools_info.cc.
-struct ResourceDevToolsInfo : base::RefCounted<ResourceDevToolsInfo> {
+// TODO(mgiuca): Avoid using UnsafeRefCounted. http://crbug.com/469952.
+struct ResourceDevToolsInfo : base::UnsafeRefCounted<ResourceDevToolsInfo> {
   typedef base::StringPairs HeadersVector;
 
   CONTENT_EXPORT ResourceDevToolsInfo();
@@ -32,7 +33,7 @@ struct ResourceDevToolsInfo : base::RefCounted<ResourceDevToolsInfo> {
   std::string response_headers_text;
 
  private:
-  friend class base::RefCounted<ResourceDevToolsInfo>;
+  friend class base::UnsafeRefCounted<ResourceDevToolsInfo>;
   CONTENT_EXPORT ~ResourceDevToolsInfo();
 };