Specify AllowCaching = false for some ChromeOS UI pages

chrome/browser/ui/webui/chromeos/proxy_settings_ui.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/browser/ui/webui/chromeos/proxy_settings_ui.h"
 
 #include <memory>
 
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
@@ skipping 28 matching lines @@
   // 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&) const override {
     return "text/html";
   }
   bool ShouldAddContentSecurityPolicy() const override { return false; }
+  bool AllowCaching() const override {
+    // Should not be cached to reflect dynamically-generated contents that
+    // may depend on current settings.
+    return false;
+  }
 
  protected:
   ~ProxySettingsHTMLSource() override {}
 
  private:
   std::unique_ptr<base::DictionaryValue> localized_strings_;
 
   DISALLOW_COPY_AND_ASSIGN(ProxySettingsHTMLSource);
 };
 
@@ skipping 67 matching lines @@
   if (!initialized_handlers_) {
     core_handler_->InitializeHandler();
     proxy_handler_->InitializeHandler();
     initialized_handlers_ = true;
   }
   core_handler_->InitializePage();
   proxy_handler_->InitializePage();
 }
 
 }  // namespace chromeos