Make URLRequestThrottlerManager a member of URLRequestContext.

content/common/net/url_fetcher_core.cc

Index: content/common/net/url_fetcher_core.cc
diff --git a/content/common/net/url_fetcher_core.cc b/content/common/net/url_fetcher_core.cc
index c384146c0c2bda719755f616076a2060d141df58..5ab4311c7ef10dc05542ecf57885bd69c1e38b24 100644
--- a/content/common/net/url_fetcher_core.cc
+++ b/content/common/net/url_fetcher_core.cc
@@ -16,6 +16,7 @@
 #include "net/base/load_flags.h"
 #include "net/base/net_errors.h"
 #include "net/http/http_response_headers.h"
+#include "net/url_request/url_request_context.h"
 #include "net/url_request/url_request_context_getter.h"
 #include "net/url_request/url_request_throttler_manager.h"
 
@@ -602,7 +603,7 @@ void URLFetcherCore::OnReadCompleted(net::URLRequest* request,
 
   url_ = request->url();
   url_throttler_entry_ =
-      net::URLRequestThrottlerManager::GetInstance()->RegisterRequestUrl(url_);
+      request->context()->throttler_manager()->RegisterRequestUrl(url_);
 
   bool waiting_on_write = false;
   do {
@@ -788,10 +789,12 @@ void URLFetcherCore::StartURLRequestWhenAppropriate() {
   if (was_cancelled_)
     return;
 
+  DCHECK(request_context_getter_);
+
   if (original_url_throttler_entry_ == NULL) {
     original_url_throttler_entry_ =
-        net::URLRequestThrottlerManager::GetInstance()->RegisterRequestUrl(
-            original_url_);
+        request_context_getter_->GetURLRequestContext()->
+            throttler_manager()->RegisterRequestUrl(original_url_);
   }
 
   int64 delay = original_url_throttler_entry_->ReserveSendingTimeForNextRequest(