Fix for pinch virtual viewport flag wasn't fully enabled.

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 <algorithm>
 #include <iterator>
 #include <map>
 #include <set>
@@ skipping 971 matching lines @@
     IDS_FLAGS_ENABLE_PINCH_SCALE_NAME,
     IDS_FLAGS_ENABLE_PINCH_SCALE_DESCRIPTION,
     kOsLinux | kOsWin | kOsCrOS,
     ENABLE_DISABLE_VALUE_TYPE(switches::kEnablePinch, switches::kDisablePinch),
   },
 #endif  // defined(USE_ASH)
   {
     "enable-pinch-virtual-viewport",
     IDS_FLAGS_ENABLE_PINCH_VIRTUAL_VIEWPORT_NAME,
     IDS_FLAGS_ENABLE_PINCH_VIRTUAL_VIEWPORT_DESCRIPTION,
-    kOsLinux | kOsWin | kOsAndroid,
-    SINGLE_VALUE_TYPE(cc::switches::kEnablePinchVirtualViewport),
+    kOsLinux | kOsWin | kOsCrOS | kOsAndroid,
+    ENABLE_DISABLE_VALUE_TYPE(
+        cc::switches::kEnablePinchVirtualViewport,
+        cc::switches::kDisablePinchVirtualViewport),
   },
   {
     "enable-viewport-meta",
     IDS_FLAGS_ENABLE_VIEWPORT_META_NAME,
     IDS_FLAGS_ENABLE_VIEWPORT_META_DESCRIPTION,
     kOsLinux | kOsWin | kOsCrOS | kOsMac,
     SINGLE_VALUE_TYPE(switches::kEnableViewportMeta),
   },
 #if defined(OS_CHROMEOS)
   {
@@ skipping 1299 matching lines @@
 }
 
 const Experiment* GetExperiments(size_t* count) {
   *count = num_experiments;
   return experiments;
 }
 
 }  // namespace testing
 
 }  // namespace about_flags