Use correct WebTestDelegate from WebViewTestClient and WebTestProxyBase.

components/test_runner/web_test_proxy.cc

Index: components/test_runner/web_test_proxy.cc
diff --git a/components/test_runner/web_test_proxy.cc b/components/test_runner/web_test_proxy.cc
index 16113f9a8144f5ec84ee34bfd87a8e3d77bf574e..ed62aa30ddfe21ec598a49e1eaa6d9a37223faaa 100644
--- a/components/test_runner/web_test_proxy.cc
+++ b/components/test_runner/web_test_proxy.cc
@@ -92,10 +92,6 @@ void WebTestProxyBase::SetInterfaces(WebTestInterfaces* interfaces) {
   test_interfaces_->WindowOpened(this);
 }
 
-void WebTestProxyBase::SetDelegate(WebTestDelegate* delegate) {
-  delegate_ = delegate;
-}
-
 std::string WebTestProxyBase::DumpBackForwardLists() {
   return DumpAllBackForwardLists(test_interfaces_, delegate_);
 }