Move WebMouseEvent into its own header file.

components/printing/test/print_web_view_helper_browsertest.cc

 // Copyright (c) 2012 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.
 
 #include "components/printing/renderer/print_web_view_helper.h"
 
 #include <stddef.h>
 
 #include <memory>
 #include <tuple>
 #include <utility>
 
 #include "base/command_line.h"
 #include "base/macros.h"
 #include "base/run_loop.h"
 #include "build/build_config.h"
 #include "components/printing/common/print_messages.h"
 #include "components/printing/test/mock_printer.h"
 #include "components/printing/test/print_mock_render_thread.h"
 #include "components/printing/test/print_test_content_renderer_client.h"
 #include "content/public/renderer/render_frame.h"
 #include "content/public/renderer/render_view.h"
 #include "content/public/test/render_view_test.h"
 #include "ipc/ipc_listener.h"
 #include "printing/features/features.h"
 #include "printing/print_job_constants.h"
 #include "testing/gtest/include/gtest/gtest.h"
+#include "third_party/WebKit/public/platform/WebMouseEvent.h"
 #include "third_party/WebKit/public/platform/WebString.h"
 #include "third_party/WebKit/public/web/WebLocalFrame.h"
 #include "third_party/WebKit/public/web/WebRange.h"
 #include "third_party/WebKit/public/web/WebView.h"
 
 #if defined(OS_WIN) || defined(OS_MACOSX)
 #include "base/files/file_util.h"
 #include "printing/image.h"
 
 using blink::WebFrame;
@@ skipping 1022 matching lines @@
 
   VerifyPrintFailed(true);
   VerifyPagesPrinted(false);
 }
 #endif  // BUILDFLAG(ENABLE_BASIC_PRINTING)
 #endif  // BUILDFLAG(ENABLE_PRINT_PREVIEW)
 
 #endif  // !defined(OS_CHROMEOS)
 
 }  // namespace printing