[DevTools] Add toolbox web contents to show in undocked mode.

chrome/browser/ui/cocoa/browser_window_controller_private.mm

Index: chrome/browser/ui/cocoa/browser_window_controller_private.mm
diff --git a/chrome/browser/ui/cocoa/browser_window_controller_private.mm b/chrome/browser/ui/cocoa/browser_window_controller_private.mm
index 3ca80212125480e06ec920c250f82a07c23a9854..4ff48d50835572bf7279d427326bd8a9ba1c95ec 100644
--- a/chrome/browser/ui/cocoa/browser_window_controller_private.mm
+++ b/chrome/browser/ui/cocoa/browser_window_controller_private.mm
@@ -1000,12 +1000,9 @@ willPositionSheet:(NSWindow*)sheet
   allowOverlappingViews = YES;
   contents->SetAllowOverlappingViews(allowOverlappingViews);
 
-  DevToolsWindow* devToolsWindow =
-      DevToolsWindow::GetDockedInstanceForInspectedTab(contents);
-  if (devToolsWindow) {
-    devToolsWindow->web_contents()->
-        SetAllowOverlappingViews(allowOverlappingViews);
-  }
+  WebContents* devTools = DevToolsWindow::GetInTabWebContents(contents, NULL);
+  if (devTools)
+    devTools->SetAllowOverlappingViews(allowOverlappingViews);
 }
 
 - (void)updateInfoBarTipVisibility {