clang-format all pdfium code.

fpdfsdk/include/pdfwindow/PWL_Button.h

 // Copyright 2014 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #ifndef FPDFSDK_INCLUDE_PDFWINDOW_PWL_BUTTON_H_
 #define FPDFSDK_INCLUDE_PDFWINDOW_PWL_BUTTON_H_
 
 #include "PWL_Wnd.h"
 
-class CPWL_Button : public CPWL_Wnd
-{
-public:
-        CPWL_Button();
-        virtual ~CPWL_Button();
+class CPWL_Button : public CPWL_Wnd {
+ public:
+  CPWL_Button();
+  virtual ~CPWL_Button();
 
-        virtual CFX_ByteString          GetClassName() const;
-        virtual void                            OnCreate(PWL_CREATEPARAM & cp);
-        virtual FX_BOOL                         OnLButtonDown(const CPDF_Point & point, FX_DWORD nFlag);
-        virtual FX_BOOL                         OnLButtonUp(const CPDF_Point & point, FX_DWORD nFlag);
+  virtual CFX_ByteString GetClassName() const;
+  virtual void OnCreate(PWL_CREATEPARAM& cp);
+  virtual FX_BOOL OnLButtonDown(const CPDF_Point& point, FX_DWORD nFlag);
+  virtual FX_BOOL OnLButtonUp(const CPDF_Point& point, FX_DWORD nFlag);
 
-protected:
-        FX_BOOL                                         m_bMouseDown;
+ protected:
+  FX_BOOL m_bMouseDown;
 };
 
 #endif  // FPDFSDK_INCLUDE_PDFWINDOW_PWL_BUTTON_H_