Fix a browser crash when the async resource handler keeps an...

chrome/browser/renderer_host/async_resource_handler.cc

Index: chrome/browser/renderer_host/async_resource_handler.cc
===================================================================
--- chrome/browser/renderer_host/async_resource_handler.cc	(revision 9407)
+++ chrome/browser/renderer_host/async_resource_handler.cc	(working copy)
@@ -103,6 +103,8 @@
     // it's killing our read_buffer_, and we don't want that when we pause
     // the request.
     rdh_->OnDataReceivedACK(render_process_host_id_, request_id);
+    // We just unmapped the memory.
+    read_buffer_ = NULL;
     return false;
   }
   // We just unmapped the memory.
@@ -130,5 +132,8 @@
 
 // static
 void AsyncResourceHandler::GlobalCleanup() {
-  spare_read_buffer_ = NULL;
+  if (spare_read_buffer_) {
+    spare_read_buffer_->Release();
+    spare_read_buffer_ = NULL;
+  }
 }