Add --use-more-webui runtime flag to toggle WebUI replacements for native dialogs.

chrome/browser/ui/webui/hung_renderer_dialog.cc

Index: chrome/browser/ui/webui/hung_renderer_dialog.cc
diff --git a/chrome/browser/ui/webui/hung_renderer_dialog.cc b/chrome/browser/ui/webui/hung_renderer_dialog.cc
index 0bdfa6acf8c310d2edfc19c774122e78e7e62b6d..5f9adbb2f02278da2024fb634a367c39e783e658 100644
--- a/chrome/browser/ui/webui/hung_renderer_dialog.cc
+++ b/chrome/browser/ui/webui/hung_renderer_dialog.cc
@@ -11,6 +11,7 @@
 #include "base/values.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_list.h"
+#include "chrome/browser/ui/browser_dialogs.h"
 #include "chrome/common/logging_chrome.h"
 #include "chrome/common/url_constants.h"
 #include "content/browser/renderer_host/render_view_host.h"
@@ -29,22 +30,32 @@ const int kHungRendererDialogHeight = 200;
 namespace browser {
 
 void ShowHungRendererDialog(TabContents* contents) {
-  if (!logging::DialogsAreSuppressed()) {
-    if (!g_instance) {
-      g_instance = new HungRendererDialog();
-    } else {
-      NOTIMPLEMENTED() << " ShowHungRendererDialog called twice.";
-      return;
+  if (ChromeWebUI::IsMoreWebUI()) {
+    if (!logging::DialogsAreSuppressed()) {
+      if (!g_instance) {
+        g_instance = new HungRendererDialog();
+      } else {
+        NOTIMPLEMENTED() << " ShowHungRendererDialog called twice.";
+        return;
+      }
+      g_instance->ShowDialog(NULL, contents);
     }
-    g_instance->ShowDialog(NULL, contents);
+    return;
   }
+
+  ShowNativeHungRendererDialog(contents);
 }
 
 void HideHungRendererDialog(TabContents* contents) {
-  if (!logging::DialogsAreSuppressed() && g_instance) {
-    // TODO(wyck): Hide the webui hung renderer dialog.
-    NOTIMPLEMENTED() << " TODO: Hide the webui hung renderer dialog.";
+  if (ChromeWebUI::IsMoreWebUI()) {
+    if (!logging::DialogsAreSuppressed() && g_instance) {
+      // TODO(wyck): Hide the webui hung renderer dialog.
+      NOTIMPLEMENTED() << " TODO: Hide the webui hung renderer dialog.";
+    }
+    return;
   }
+
+  HideNativeHungRendererDialog(contents);
 }
 
 }  // namespace browser