Always use ENABLE_PLUGINS to indicate plugins support.

chrome/app/chrome_main_delegate.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 "chrome/app/chrome_main_delegate.h"
 
 #include "base/base_paths.h"
 #include "base/command_line.h"
 #include "base/cpu.h"
 #include "base/files/file_path.h"
@@ skipping 792 matching lines @@
   SuppressWindowsErrorDialogs();
 #endif
 
 #if defined(CHROME_MULTIPLE_DLL_CHILD) || !defined(CHROME_MULTIPLE_DLL_BROWSER)
 #if !defined(DISABLE_NACL)
   ChromeContentClient::SetNaClEntryFunctions(
       nacl_plugin::PPP_GetInterface,
       nacl_plugin::PPP_InitializeModule,
       nacl_plugin::PPP_ShutdownModule);
 #endif
-#if defined(ENABLE_PLUGINS)
+#if defined(ENABLE_PLUGINS) && defined(ENABLE_PDF)
   ChromeContentClient::SetPDFEntryFunctions(
       chrome_pdf::PPP_GetInterface,
       chrome_pdf::PPP_InitializeModule,
       chrome_pdf::PPP_ShutdownModule);
 #endif
 #endif
 }
 
 int ChromeMainDelegate::RunProcess(
     const std::string& process_type,
@@ skipping 141 matching lines @@
     case version_info::Channel::CANARY:
       return true;
     case version_info::Channel::DEV:
     case version_info::Channel::BETA:
     case version_info::Channel::STABLE:
     default:
       // Don't enable instrumentation.
       return false;
   }
 }