Change the flag which enables OOP PDF to an enable/disable flag

chrome/browser/about_flags.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/browser/about_flags.h"
 
 #include <iterator>
 #include <map>
 #include <set>
 #include <utility>
@@ skipping 1659 matching lines @@
   },
   {
     "enable-session-crashed-bubble",
     IDS_FLAGS_ENABLE_SESSION_CRASHED_BUBBLE_NAME,
     IDS_FLAGS_ENABLE_SESSION_CRASHED_BUBBLE_DESCRIPTION,
     kOsWin | kOsLinux,
     ENABLE_DISABLE_VALUE_TYPE(switches::kEnableSessionCrashedBubble,
                               switches::kDisableSessionCrashedBubble)
   },
   {
-    "out-of-process-pdf",
+    "enable-out-of-process-pdf",
     IDS_FLAGS_OUT_OF_PROCESS_PDF_NAME,
     IDS_FLAGS_OUT_OF_PROCESS_PDF_DESCRIPTION,
     kOsDesktop,
-    SINGLE_VALUE_TYPE(switches::kOutOfProcessPdf)
+    ENABLE_DISABLE_VALUE_TYPE(switches::kEnableOutOfProcessPdf,
+                              switches::kDisableOutOfProcessPdf)
   },
   {
     "disable-cast-streaming-hw-encoding",
     IDS_FLAGS_DISABLE_CAST_STREAMING_HW_ENCODING_NAME,
     IDS_FLAGS_DISABLE_CAST_STREAMING_HW_ENCODING_DESCRIPTION,
     kOsAll,
     SINGLE_VALUE_TYPE(switches::kDisableCastStreamingHWEncoding)
   },
 #if defined(OS_ANDROID)
   {
@@ skipping 881 matching lines @@
 }
 
 const Experiment* GetExperiments(size_t* count) {
   *count = num_experiments;
   return experiments;
 }
 
 }  // namespace testing
 
 }  // namespace about_flags