Fix all the code which has duplicate variable declarations

core/fxge/ge/fx_ge_device.cpp

 // 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
 
 #include "core/fxge/include/fx_ge.h"
 
 CFX_RenderDevice::CFX_RenderDevice() {
   m_pDeviceDriver = NULL;
@@ skipping 370 matching lines @@
     }
     if (!m_pDeviceDriver->GetDIBits(&background, dest_rect.left,
                                     dest_rect.top)) {
       return FALSE;
     }
     if (!background.CompositeBitmap(0, 0, bg_pixel_width, bg_pixel_height,
                                     pBitmap, src_rect.left, src_rect.top,
                                     blend_mode, nullptr, FALSE, nullptr)) {
       return FALSE;
     }
-    FX_RECT src_rect(0, 0, bg_pixel_width, bg_pixel_height);
-    return m_pDeviceDriver->SetDIBits(&background, 0, &src_rect, dest_rect.left,
+    FX_RECT rect(0, 0, bg_pixel_width, bg_pixel_height);
+    return m_pDeviceDriver->SetDIBits(&background, 0, &rect, dest_rect.left,
                                       dest_rect.top, FXDIB_BLEND_NORMAL);
   }
   return m_pDeviceDriver->SetDIBits(pBitmap, 0, &src_rect, dest_rect.left,
                                     dest_rect.top, blend_mode, 0, nullptr);
 }
 
 FX_BOOL CFX_RenderDevice::StretchDIBitsWithFlagsAndBlend(
     const CFX_DIBSource* pBitmap,
     int left,
     int top,
@@ skipping 46 matching lines @@
                                       flags, handle, 0, nullptr, blend_mode);
 }
 
 FX_BOOL CFX_RenderDevice::ContinueDIBits(void* handle, IFX_Pause* pPause) {
   return m_pDeviceDriver->ContinueDIBits(handle, pPause);
 }
 
 void CFX_RenderDevice::CancelDIBits(void* handle) {
   m_pDeviceDriver->CancelDIBits(handle);
 }