Introduce ResourceRequesterInfo to abstract the requester of resource request

content/browser/loader/resource_message_filter.h

Index: content/browser/loader/resource_message_filter.h
diff --git a/content/browser/loader/resource_message_filter.h b/content/browser/loader/resource_message_filter.h
index 651ca8eb33dd70ba8815a161a8044cc59536b9fa..0d3d443da8ef6e4bac211cbd75285cb44f3ddd80 100644
--- a/content/browser/loader/resource_message_filter.h
+++ b/content/browser/loader/resource_message_filter.h
@@ -53,7 +53,6 @@ class CONTENT_EXPORT ResourceMessageFilter
   // (and may be invalid) for requests that are NOT from the NPAPI plugin
   // process.
   ResourceMessageFilter(int child_id,
-                        int process_type,
                         ChromeAppCacheService* appcache_service,
                         ChromeBlobStorageContext* blob_storage_context,
                         storage::FileSystemContext* file_system_context,
@@ -89,7 +88,6 @@ class CONTENT_EXPORT ResourceMessageFilter
   }
 
   int child_id() const { return child_id_; }
-  int process_type() const { return process_type_; }
 
   base::WeakPtr<ResourceMessageFilter> GetWeakPtr();
 
@@ -115,8 +113,6 @@ class CONTENT_EXPORT ResourceMessageFilter
   // The ID of the child process.
   int child_id_;
 
-  int process_type_;
-
   scoped_refptr<ChromeAppCacheService> appcache_service_;
   scoped_refptr<ChromeBlobStorageContext> blob_storage_context_;
   scoped_refptr<storage::FileSystemContext> file_system_context_;