Move DumpBackForwardLists out of WebTestProxyBase.

components/test_runner/web_test_interfaces.cc

Index: components/test_runner/web_test_interfaces.cc
diff --git a/components/test_runner/web_test_interfaces.cc b/components/test_runner/web_test_interfaces.cc
index 032de93e868f495e08f5e37f5b6033621d94aec9..37423cca2cb4951dfa39ff82ec517100d26c5ebd 100644
--- a/components/test_runner/web_test_interfaces.cc
+++ b/components/test_runner/web_test_interfaces.cc
@@ -15,6 +15,7 @@
 #include "components/test_runner/test_interfaces.h"
 #include "components/test_runner/test_runner.h"
 #include "components/test_runner/web_frame_test_client.h"
+#include "components/test_runner/web_test_proxy.h"
 #include "components/test_runner/web_view_test_client.h"
 
 using namespace blink;
@@ -110,4 +111,11 @@ scoped_ptr<WebViewTestClient> WebTestInterfaces::CreateWebViewTestClient(
                                                web_test_proxy_base));
 }
 
+std::vector<blink::WebView*> WebTestInterfaces::GetWindowList() {
+  std::vector<blink::WebView*> result;
+  for (WebTestProxyBase* proxy : interfaces_->GetWindowList())
+    result.push_back(proxy->web_view());
+  return result;
+}
+
 }  // namespace test_runner