Specify AllowCaching = false for some ChromeOS UI pages

chrome/browser/ui/webui/chromeos/slow_trace_ui.h

 // Copyright 2013 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.
 
 #ifndef CHROME_BROWSER_UI_WEBUI_CHROMEOS_SLOW_TRACE_UI_H_
 #define CHROME_BROWSER_UI_WEBUI_CHROMEOS_SLOW_TRACE_UI_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
@@ skipping 16 matching lines @@
  public:
   SlowTraceSource();
 
   // content::URLDataSource implementation.
   std::string GetSource() const override;
   void StartDataRequest(
       const std::string& path,
       const content::ResourceRequestInfo::WebContentsGetter& wc_getter,
       const content::URLDataSource::GotDataCallback& callback) override;
   std::string GetMimeType(const std::string& path) const override;
+  bool AllowCaching() const override;
 
  private:
   ~SlowTraceSource() override;
 
   void OnGetTraceData(const content::URLDataSource::GotDataCallback& callback,
                       scoped_refptr<base::RefCountedString> trace_data);
 
   DISALLOW_COPY_AND_ASSIGN(SlowTraceSource);
 };
 
 class SlowTraceController : public content::WebUIController {
  public:
   explicit SlowTraceController(content::WebUI* web_ui);
 
  private:
   DISALLOW_COPY_AND_ASSIGN(SlowTraceController);
 };
 
 } // namespace chromeos
 
 #endif  // CHROME_BROWSER_UI_WEBUI_CHROMEOS_SLOW_TRACE_UI_H_