Move DumpBackForwardLists out of 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 013c696efa601031f04c8529d2657f1ae47cdfee..75298ccacf2a7cb1a74de55f6fe0f2e4ca2cd025 100644
--- a/components/test_runner/web_test_proxy.cc
+++ b/components/test_runner/web_test_proxy.cc
@@ -15,20 +15,6 @@
 
 namespace test_runner {
 
-namespace {
-
-std::string DumpAllBackForwardLists(TestInterfaces* interfaces,
-                                    WebTestDelegate* delegate) {
-  std::string result;
-  const std::vector<WebTestProxyBase*>& window_list =
-      interfaces->GetWindowList();
-  for (size_t i = 0; i < window_list.size(); ++i)
-    result.append(delegate->DumpHistoryForWindow(window_list.at(i)));
-  return result;
-}
-
-}  // namespace
-
 WebTestProxyBase::WebTestProxyBase()
     : test_interfaces_(nullptr),
       delegate_(nullptr),
@@ -44,10 +30,6 @@ void WebTestProxyBase::SetInterfaces(WebTestInterfaces* interfaces) {
   test_interfaces_->WindowOpened(this);
 }
 
-std::string WebTestProxyBase::DumpBackForwardLists() {
-  return DumpAllBackForwardLists(test_interfaces_, delegate_);
-}
-
 void WebTestProxyBase::GetScreenOrientationForTesting(
     blink::WebScreenInfo& screen_info) {
   MockScreenOrientationClient* mock_client =