Clean up some PDF code.

pdf/out_of_process_instance.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/out_of_process_instance.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>  // for min/max()
@@ skipping 303 matching lines @@
 bool OutOfProcessInstance::Init(uint32_t argc,
                                 const char* argn[],
                                 const char* argv[]) {
   // Check if the PDF is being loaded in the PDF chrome extension. We only allow
   // the plugin to be loaded in the extension and print preview to avoid
   // exposing sensitive APIs directly to external websites.
   pp::Var document_url_var = pp::URLUtil_Dev::Get()->GetDocumentURL(this);
   if (!document_url_var.is_string())
     return false;
   std::string document_url = document_url_var.AsString();
-  std::string extension_url = std::string(kChromeExtension);
-  std::string print_preview_url = std::string(kChromePrint);
-  if (!base::StringPiece(document_url).starts_with(kChromeExtension) &&
-      !base::StringPiece(document_url).starts_with(kChromePrint)) {
+  base::StringPiece document_url_piece(document_url);
+  if (!document_url_piece.starts_with(kChromeExtension) &&
+      !document_url_piece.starts_with(kChromePrint)) {
     return false;
   }
 
   // Check if the plugin is full frame. This is passed in from JS.
   for (uint32_t i = 0; i < argc; ++i) {
     if (strcmp(argn[i], "full-frame") == 0) {
       full_ = true;
       break;
     }
   }
@@ skipping 1185 matching lines @@
     const pp::FloatPoint& scroll_offset) {
   float max_x = document_size_.width() * zoom_ - plugin_dip_size_.width();
   float x = std::max(std::min(scroll_offset.x(), max_x), 0.0f);
   float min_y = -top_toolbar_height_;
   float max_y = document_size_.height() * zoom_ - plugin_dip_size_.height();
   float y = std::max(std::min(scroll_offset.y(), max_y), min_y);
   return pp::FloatPoint(x, y);
 }
 
 }  // namespace chrome_pdf