Remove an unneeded variable in PDF's ScopedUnsupportedFeature.

pdf/pdfium/pdfium_engine.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 "pdf/pdfium/pdfium_engine.h"
 
 #include <math.h>
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 3674 matching lines @@
   return path.size() + 1;
 }
 
 FPDF_BOOL PDFiumEngine::Pause_NeedToPauseNow(IFSDK_PAUSE* param) {
   PDFiumEngine* engine = static_cast<PDFiumEngine*>(param);
   return (base::Time::Now() - engine->last_progressive_start_time_).
       InMilliseconds() > engine->progressive_paint_timeout_;
 }
 
 ScopedUnsupportedFeature::ScopedUnsupportedFeature(PDFiumEngine* engine)
-    : engine_(engine), old_engine_(g_engine_for_unsupported) {
-  g_engine_for_unsupported = engine_;
+    : old_engine_(g_engine_for_unsupported) {
+  g_engine_for_unsupported = engine;
 }
 
 ScopedUnsupportedFeature::~ScopedUnsupportedFeature() {
   g_engine_for_unsupported = old_engine_;
 }
 
 namespace {
 
 base::LazyInstance<PDFiumEngineExports>::Leaky g_pdf_engine_exports =
     LAZY_INSTANCE_INITIALIZER;
@@ skipping 211 matching lines @@
   FPDF_DOCUMENT doc =
       FPDF_LoadMemDocument(pdf_buffer, pdf_buffer_size, nullptr);
   if (!doc)
     return false;
   bool success = FPDF_GetPageSizeByIndex(doc, page_number, width, height) != 0;
   FPDF_CloseDocument(doc);
   return success;
 }
 
 }  // namespace chrome_pdf