Implement $Secure- cookie prefix

chrome/browser/chrome_content_browser_client.h

Index: chrome/browser/chrome_content_browser_client.h
diff --git a/chrome/browser/chrome_content_browser_client.h b/chrome/browser/chrome_content_browser_client.h
index 2d5ee0343d9e622ee17352c9dc2bbfb3eae5f0e6..b1df66d0d982a9cdc86dc317f9d5e6b2ddc564b9 100644
--- a/chrome/browser/chrome_content_browser_client.h
+++ b/chrome/browser/chrome_content_browser_client.h
@@ -253,6 +253,9 @@ class ChromeContentBrowserClient : public content::ContentBrowserClient {
   void OverridePageVisibilityState(
       content::RenderFrameHost* render_frame_host,
       blink::WebPageVisibilityState* visibility_state) override;
+  // TODO(estark): remove once we decide whether to ship cookie
+  // prefixes. https://crbug.com/541511
+  bool ExperimentalFeaturesEnabled() override;
 
 #if defined(OS_ANDROID)
   void GetAdditionalMappedFilesForChildProcess(
@@ -321,6 +324,8 @@ class ChromeContentBrowserClient : public content::ContentBrowserClient {
       const base::Callback<void(bool)>& callback);
 #endif
 
+  bool experimental_web_platform_features_enabled_;
+
 #if defined(ENABLE_PLUGINS)
   // Set of origins that can use TCP/UDP private APIs from NaCl.
   std::set<std::string> allowed_socket_origins_;