Allows prefetch requests to live beyond the renderer by delaying

content/browser/loader/async_resource_handler.cc

Index: content/browser/loader/async_resource_handler.cc
diff --git a/content/browser/loader/async_resource_handler.cc b/content/browser/loader/async_resource_handler.cc
index f007a417fb8ffe997e20c439506d9f8a6834c367..9f2e5cfcc70863a0d3bff05c92dcbe2d6b274c85 100644
--- a/content/browser/loader/async_resource_handler.cc
+++ b/content/browser/loader/async_resource_handler.cc
@@ -87,7 +87,8 @@ AsyncResourceHandler::AsyncResourceHandler(
       did_defer_(false),
       has_checked_for_sufficient_resources_(false),
       sent_received_response_msg_(false),
-      sent_first_data_msg_(false) {
+      sent_first_data_msg_(false),
+      detached_reads_(false) {
   InitializeResourceBufferConstants();
 }
 
@@ -247,6 +248,11 @@ bool AsyncResourceHandler::OnReadCompleted(int request_id, int bytes_read,
   if (!bytes_read)
     return true;
 
+  if (detached_reads_) {
+    buffer_->RecycleLeastRecentlyAllocated();
+    return true;
+  }
+
   const ResourceRequestInfoImpl* info =
       ResourceRequestInfoImpl::ForRequest(request_);
   if (!info->filter())
@@ -384,4 +390,8 @@ void AsyncResourceHandler::ResumeIfDeferred() {
   }
 }
 
+void AsyncResourceHandler::DetachReads() {
+  detached_reads_ = true;
+}
+
 }  // namespace content