Handle disabling data reduction proxy for all platforms.

chrome/browser/net/spdyproxy/data_reduction_proxy_chrome_configurator.h

Index: chrome/browser/net/spdyproxy/data_reduction_proxy_chrome_configurator.h
diff --git a/chrome/browser/net/spdyproxy/data_reduction_proxy_chrome_configurator.h b/chrome/browser/net/spdyproxy/data_reduction_proxy_chrome_configurator.h
index 72051708f584d22c2c25363b4efefa6685496208..8e1fe22b14620ee3770e588c21b2af5833f43811 100644
--- a/chrome/browser/net/spdyproxy/data_reduction_proxy_chrome_configurator.h
+++ b/chrome/browser/net/spdyproxy/data_reduction_proxy_chrome_configurator.h
@@ -32,6 +32,10 @@ class DataReductionProxyChromeConfigurator
       scoped_refptr<base::SequencedTaskRunner> network_task_runner);
   ~DataReductionProxyChromeConfigurator() override;
 
+  // Set the proxy entry in browser preference to use the default system prefs

[bengr, 2014/10/29 23:41:25]

I wouldn't be so specific. How about:

// Removes the data reduction proxy configuration from the proxy
// preference. This disables use of the data reduction proxy.
// This method is public to disable the proxy on incognito.
// Disable() should be used otherwise.

[Not at Google. Contact bengr, 2014/10/30 00:05:03]

Done.

+  // and clears the server and bypass list.
+  static void DisableInProxyConfigPref(PrefService* prefs);
+
   void Enable(bool primary_restricted,
               bool fallback_restricted,
               const std::string& primary_origin,
@@ -61,6 +65,10 @@ class DataReductionProxyChromeConfigurator
  private:
   FRIEND_TEST_ALL_PREFIXES(DataReductionProxyConfigTest, TestBypassList);
 
+  // Check whether the |proxy_rules| contain any of the data reduction proxies.

[bengr, 2014/10/29 23:41:25]

Coordinate with megjablon@ who is also querying ProxyConfigs.

[Not at Google. Contact bengr, 2014/10/30 00:05:03]

Done.

+  static bool ContainsDataReductionProxy(
+      const net::ProxyConfig::ProxyRules& proxy_rules);
+
   PrefService* prefs_;
   scoped_refptr<base::SequencedTaskRunner> network_task_runner_;