Ensure pdf plugin sends DidStartLoading() consistently

chrome/renderer/printing/print_web_view_helper.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/renderer/printing/print_web_view_helper.h"
 
 #include <string>
 
 #include "base/auto_reset.h"
 #include "base/command_line.h"
@@ skipping 1685 matching lines @@
       // 1. PrintHostMsg_SetupScriptedPrintPreview blocks this call and JS by
       //    pumping messages here.
       // 2. PrintHostMsg_ShowScriptedPrintPreview shows preview once the
       //    document has been loaded.
       is_scripted_preview_delayed_ = true;
       if (is_loading_ && GetPlugin(print_preview_context_.source_frame())) {
         // Wait for DidStopLoading. Plugins may not know the correct
         // |is_modifiable| value until they are fully loaded, which occurs when
         // DidStopLoading() is called. Defer showing the preview until then.
       } else {
-        // TODO(japhet): This delay is a terrible hack. See crbug.com/376969
-        // for the motivation.
-        base::MessageLoop::current()->PostDelayedTask(
+        base::MessageLoop::current()->PostTask(
             FROM_HERE,
             base::Bind(&PrintWebViewHelper::ShowScriptedPrintPreview,
-                       weak_ptr_factory_.GetWeakPtr()),
-            base::TimeDelta::FromMilliseconds(100));
+                       weak_ptr_factory_.GetWeakPtr()));
       }
       IPC::SyncMessage* msg =
           new PrintHostMsg_SetupScriptedPrintPreview(routing_id());
       msg->EnableMessagePumping();
       Send(msg);
       is_scripted_preview_delayed_ = false;
       return;
     }
     case PRINT_PREVIEW_USER_INITIATED_ENTIRE_FRAME: {
       break;
@@ skipping 302 matching lines @@
 }
 
 void PrintWebViewHelper::PrintPreviewContext::ClearContext() {
   prep_frame_view_.reset();
   metafile_.reset();
   pages_to_render_.clear();
   error_ = PREVIEW_ERROR_NONE;
 }
 
 }  // namespace printing