Introduce ResourceRequesterInfo to abstract the requester of resource request

content/browser/loader/async_revalidation_manager.cc

Index: content/browser/loader/async_revalidation_manager.cc
diff --git a/content/browser/loader/async_revalidation_manager.cc b/content/browser/loader/async_revalidation_manager.cc
index abdf659fd228059833fa8c422dedf0099ee207a0..d441b38851461adb6356cdbd833ee06391764df9 100644
--- a/content/browser/loader/async_revalidation_manager.cc
+++ b/content/browser/loader/async_revalidation_manager.cc
@@ -9,7 +9,6 @@
 
 #include "base/logging.h"
 #include "content/browser/loader/async_revalidation_driver.h"
-#include "content/browser/loader/resource_message_filter.h"
 #include "content/browser/loader/resource_request_info_impl.h"
 #include "content/browser/loader/resource_scheduler.h"
 #include "content/common/resource_messages.h"
@@ -52,13 +51,14 @@ AsyncRevalidationManager::~AsyncRevalidationManager() {
 }
 
 void AsyncRevalidationManager::BeginAsyncRevalidation(
-    const net::URLRequest& for_request,
+    net::URLRequest& for_request,
     ResourceScheduler* scheduler) {
   DCHECK_EQ(for_request.url_chain().size(), 1u);
-  const ResourceRequestInfoImpl* info =
+  ResourceRequestInfoImpl* info =
       ResourceRequestInfoImpl::ForRequest(&for_request);
   DCHECK(info);
-  if (!info->filter()) {
+  DCHECK(info->requester_info().IsRenderer());
+  if (!info->requester_info().filter()) {
     // The child has gone away and we can no longer get ResourceContext and
     // URLRequestContext to perform async revalidation.
     // This can happen in the following cases, ordered from bad to not-so-bad
@@ -89,8 +89,8 @@ void AsyncRevalidationManager::BeginAsyncRevalidation(
 
   // The embedder of //content needs to ensure that the URLRequestContext object
   // remains valid until after the ResourceContext object is destroyed.
-  info->filter()->GetContexts(info->GetResourceType(), &resource_context,
-                              &request_context);
+  info->requester_info().GetContexts(info->GetResourceType(), &resource_context,
+                                     &request_context);
 
   AsyncRevalidationKey async_revalidation_key(
       resource_context, request_context->http_transaction_factory()->GetCache(),