Fix a regression where extension APIs would sometimes not be available on the

content/browser/renderer_host/browser_render_process_host.cc

 // Copyright (c) 2011 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.
 
 // Represents the browser side of the browser <--> renderer communication
 // channel. There will be one RenderProcessHost per renderer process.
 
 #include "content/browser/renderer_host/browser_render_process_host.h"
 
 #include <algorithm>
@@ skipping 226 matching lines @@
   // We may have some unsent messages at this point, but that's OK.
   channel_.reset();
   while (!queued_messages_.empty()) {
     delete queued_messages_.front();
     queued_messages_.pop();
   }
 
   ClearTransportDIBCache();
 }
 
+void BrowserRenderProcessHost::PrepareForReuse() {
+  // Reset is_initialized_ so we start queuing up messages passed to Send.
+  is_initialized_ = false;
+}
+
 bool BrowserRenderProcessHost::Init(bool is_accessibility_enabled) {
   // calling Init() more than once does nothing, this makes it more convenient
   // for the view host which may not be sure in some cases
   if (channel_.get())
     return true;
 
   accessibility_enabled_ = is_accessibility_enabled;
 
   CommandLine::StringType renderer_prefix;
 #if defined(OS_POSIX)
@@ skipping 655 matching lines @@
 void BrowserRenderProcessHost::OnUserMetricsRecordAction(
     const std::string& action) {
   UserMetrics::RecordComputedAction(action);
 }
 
 void BrowserRenderProcessHost::OnRevealFolderInOS(const FilePath& path) {
   // Only honor the request if appropriate persmissions are granted.
   if (ChildProcessSecurityPolicy::GetInstance()->CanReadFile(id(), path))
     content::GetContentClient()->browser()->RevealFolderInOS(path);
 }