Improve performance of proxy resolver by tracing DNS dependencies.

net/proxy/multi_threaded_proxy_resolver_unittest.cc

Index: net/proxy/multi_threaded_proxy_resolver_unittest.cc
diff --git a/net/proxy/multi_threaded_proxy_resolver_unittest.cc b/net/proxy/multi_threaded_proxy_resolver_unittest.cc
index dbd2f5d7478135b37085fc9d64ba7cd81efce50d..bb856bdb36232f684d2d7d105229a28ac2d5129e 100644
--- a/net/proxy/multi_threaded_proxy_resolver_unittest.cc
+++ b/net/proxy/multi_threaded_proxy_resolver_unittest.cc
@@ -66,12 +66,6 @@ class MockProxyResolver : public ProxyResolver {
     return LOAD_STATE_IDLE;
   }
 
-  virtual LoadState GetLoadStateThreadSafe(
-      RequestHandle request) const OVERRIDE {
-    NOTREACHED();
-    return LOAD_STATE_IDLE;
-  }
-
   virtual void CancelSetPacScript() OVERRIDE {
     NOTREACHED();
   }
@@ -190,12 +184,6 @@ class ForwardingProxyResolver : public ProxyResolver {
     return LOAD_STATE_IDLE;
   }
 
-  virtual LoadState GetLoadStateThreadSafe(
-      RequestHandle request) const OVERRIDE {
-    NOTREACHED();
-    return LOAD_STATE_IDLE;
-  }
-
   virtual void CancelSetPacScript() OVERRIDE {
     impl_->CancelSetPacScript();
   }