Linux: fix a data race in a proxy config service unit test.

net/proxy/proxy_config_service_linux.h

Index: net/proxy/proxy_config_service_linux.h
===================================================================
--- net/proxy/proxy_config_service_linux.h	(revision 26750)
+++ net/proxy/proxy_config_service_linux.h	(working copy)
@@ -33,6 +33,7 @@
     // files. Defined here so unit tests can construct worst-case inputs.
     static const size_t BUFFER_SIZE = 512;
 
+    GConfSettingGetter() {}
     virtual ~GConfSettingGetter() {}
 
     // Initializes the class: obtains a gconf client, or simulates one, in
@@ -74,6 +75,9 @@
     // And for a string list.
     virtual bool GetStringList(const char* key,
                                std::vector<std::string>* result) = 0;
+
+   private:
+    DISALLOW_COPY_AND_ASSIGN(GConfSettingGetter);
   };
 
   // ProxyConfigServiceLinux is created on the UI thread, and
@@ -117,10 +121,6 @@
     void SetupAndFetchInitialConfig(MessageLoop* glib_default_loop,
                                     MessageLoop* io_loop,
                                     MessageLoopForIO* file_loop);
-    // Resets cached_config_ and releases the gconf_getter_, making it
-    // possible to call SetupAndFetchInitialConfig() again. Only used
-    // in testing.
-    void Reset();
 
     // Handler for gconf change notifications: fetches a new proxy
     // configuration from gconf settings, and if this config is
@@ -214,9 +214,6 @@
     delegate_->SetupAndFetchInitialConfig(glib_default_loop, io_loop,
                                           file_loop);
   }
-  void Reset() {
-    delegate_->Reset();
-  }
   void OnCheckProxyConfigSettings() {
     delegate_->OnCheckProxyConfigSettings();
   }