DevTools: fix memory issue with layout test

content/shell/browser/layout_test/blink_test_controller.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_SHELL_BROWSER_LAYOUT_TEST_BLINK_TEST_CONTROLLER_H_
 #define CONTENT_SHELL_BROWSER_LAYOUT_TEST_BLINK_TEST_CONTROLLER_H_
 
 #include <map>
 #include <memory>
 #include <ostream>
@@ skipping 214 matching lines @@
                                          const std::string& argument);
   mojom::LayoutTestControl* GetLayoutTestControlPtr(RenderFrameHost* frame);
   void HandleLayoutTestControlError(RenderFrameHost* frame);
 
   std::unique_ptr<BlinkTestResultPrinter> printer_;
 
   base::FilePath current_working_directory_;
   base::FilePath temp_path_;
 
   Shell* main_window_;
-  std::unique_ptr<Shell> devtools_window_;
+  Shell* devtools_window_;
 
   std::unique_ptr<LayoutTestDevToolsBindings> devtools_bindings_;
 
   // The PID of the render process of the render view host of main_window_.
   int current_pid_;
 
   // Tracks if (during the current test) we have already sent *initial* test
   // configuration to a renderer process (*initial* test configuration is
   // associated with some steps that should only be executed *once* per test -
   // for example resizing the window and setting the focus).
@@ skipping 51 matching lines @@
   // waiting on the UI thread while layout tests are being ran.
   ScopedAllowWaitForAndroidLayoutTests reduced_restrictions_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(BlinkTestController);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_SHELL_BROWSER_LAYOUT_TEST_BLINK_TEST_CONTROLLER_H_