Don't check if the internal plugin exists when someone just asks for its path...

chrome/renderer/render_process_impl.cc

 // Copyright (c) 2010 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 "build/build_config.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
 #include <objidl.h>
 #include <mlang.h>
@@ skipping 166 matching lines @@
 
   // TODO(hclam): Add more checks here. Currently this is not used.
   if (CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kEnableOpenMax)) {
     media::InitializeOpenMaxLibrary(module_path);
   }
 #endif
 
   // Load the pdf plugin before the sandbox is turned on.
   FilePath pdf;
-  if (PathService::Get(chrome::FILE_PDF_PLUGIN, &pdf)) {
+  if (PathService::Get(chrome::FILE_PDF_PLUGIN, &pdf) &&
+      file_util::PathExists(pdf)) {
     static scoped_refptr<NPAPI::PluginLib> pdf_lib =
         NPAPI::PluginLib::CreatePluginLib(pdf);
     // Load the plugin now before the sandbox engages and keep it always loaded.
     pdf_lib->EnsureAlwaysLoaded();
 
 #if defined(OS_WIN)
     g_iat_patch_createdca.Patch(
         pdf_lib->plugin_info().path.value().c_str(),
         "gdi32.dll", "CreateDCA", CreateDCAPatch);
     g_iat_patch_get_font_data.Patch(
@@ skipping 163 matching lines @@
 }
 
 void RenderProcessImpl::ClearTransportDIBCache() {
   for (size_t i = 0; i < arraysize(shared_mem_cache_); ++i) {
     if (shared_mem_cache_[i]) {
       FreeTransportDIB(shared_mem_cache_[i]);
       shared_mem_cache_[i] = NULL;
     }
   }
 }