Move GetDocument method from WebFrame to WebLocalFrame.

content/shell/renderer/layout_test/blink_test_runner.cc

Index: content/shell/renderer/layout_test/blink_test_runner.cc
diff --git a/content/shell/renderer/layout_test/blink_test_runner.cc b/content/shell/renderer/layout_test/blink_test_runner.cc
index 09c91b67a66ea057195c38a7fef7b219d18e50c6..18ed15316b27fef73c33b755048cfa60d30386c2 100644
--- a/content/shell/renderer/layout_test/blink_test_runner.cc
+++ b/content/shell/renderer/layout_test/blink_test_runner.cc
@@ -10,6 +10,7 @@
 #include <clocale>
 #include <cmath>
 #include <memory>
+#include <string>
 #include <utility>
 
 #include "base/base64.h"
@@ -1050,8 +1051,12 @@ void BlinkTestRunner::OnTestFinishedInSecondaryRenderer() {
 
 void BlinkTestRunner::OnTryLeakDetection() {
   blink::WebFrame* main_frame = render_view()->GetWebView()->MainFrame();
-  DCHECK_EQ(GURL(url::kAboutBlankURL), GURL(main_frame->GetDocument().Url()));
+
   DCHECK(!main_frame->IsLoading());
+  if (main_frame->IsWebLocalFrame()) {
+    DCHECK_EQ(GURL(url::kAboutBlankURL),
+              GURL(main_frame->ToWebLocalFrame()->GetDocument().Url()));
+  }
 
   leak_detector_->TryLeakDetection(main_frame);
 }