DRP: Make secure proxy check URL a DRP param

components/data_reduction_proxy/core/common/data_reduction_proxy_params.h

Index: components/data_reduction_proxy/core/common/data_reduction_proxy_params.h
diff --git a/components/data_reduction_proxy/core/common/data_reduction_proxy_params.h b/components/data_reduction_proxy/core/common/data_reduction_proxy_params.h
index ed5cd106f48b153e71fa4204279ef02b784eaa8a..f65969a03393ef02e30abda2dcdb58ce4182f0e0 100644
--- a/components/data_reduction_proxy/core/common/data_reduction_proxy_params.h
+++ b/components/data_reduction_proxy/core/common/data_reduction_proxy_params.h
@@ -170,6 +170,10 @@ bool GetOverrideProxiesForHttpFromCommandLine(
 // Returns the name of the server side experiment field trial.
 const char* GetServerExperimentsFieldTrialName();
 
+// Returns the URL to check to decide if the secure proxy origin should be
+// used.
+GURL GetSecureProxyCheckURL();
+
 // Returns true if fetching of the warmup URL is enabled.
 bool FetchWarmupURLEnabled();
 
@@ -209,8 +213,6 @@ class DataReductionProxyParams : public DataReductionProxyConfigValues {
   const std::vector<DataReductionProxyServer>& proxies_for_http()
       const override;
 
-  const GURL& secure_proxy_check_url() const override;
-
  protected:
   // Test constructor that optionally won't call Init();
   explicit DataReductionProxyParams(bool should_call_init);
@@ -228,7 +230,6 @@ class DataReductionProxyParams : public DataReductionProxyConfigValues {
   // and an empty string otherwise.
   virtual std::string GetDefaultOrigin() const;
   virtual std::string GetDefaultFallbackOrigin() const;
-  virtual std::string GetDefaultSecureProxyCheckURL() const;
 
  private:
   std::vector<DataReductionProxyServer> proxies_for_http_;
@@ -236,8 +237,6 @@ class DataReductionProxyParams : public DataReductionProxyConfigValues {
   net::ProxyServer origin_;
   net::ProxyServer fallback_origin_;
 
-  GURL secure_proxy_check_url_;
-
   bool use_override_proxies_for_http_;
   std::vector<DataReductionProxyServer> override_data_reduction_proxy_servers_;