Move enable extensions define to a build flag.

chrome/common/chrome_features.cc

 // Copyright 2016 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/common/chrome_features.h"
 
+#include "extensions/features/features.h"
+
 namespace features {
 
 // All features in alphabetical order.
 
 #if defined(OS_MACOSX)
 // Enables Javascript execution via AppleScript.
 const base::Feature kAppleScriptExecuteJavaScript{
     "AppleScriptExecuteJavaScript", base::FEATURE_ENABLED_BY_DEFAULT};
 #endif  // defined(OS_MACOSX)
 
@@ skipping 83 matching lines @@
 // updates" infobar instead of the "will soon stop receiving" infobar on
 // deprecated systems.
 const base::Feature kLinuxObsoleteSystemIsEndOfTheLine{
     "LinuxObsoleteSystemIsEndOfTheLine", base::FEATURE_DISABLED_BY_DEFAULT};
 #endif
 
 // Enables or disables the Material Design version of chrome://bookmarks.
 const base::Feature kMaterialDesignBookmarks{"MaterialDesignBookmarks",
                                              base::FEATURE_DISABLED_BY_DEFAULT};
 
-#if defined(ENABLE_EXTENSIONS)
+#if BUILDFLAG(ENABLE_EXTENSIONS)
 // Enabled or disabled the Material Design version of chrome://extensions.
 const base::Feature kMaterialDesignExtensions{
     "MaterialDesignExtensions", base::FEATURE_DISABLED_BY_DEFAULT};
 #endif
 
 // Enables or disables the Material Design version of chrome://history.
 const base::Feature kMaterialDesignHistory{"MaterialDesignHistory",
                                            base::FEATURE_ENABLED_BY_DEFAULT};
 
 // Enables or disables the Material Design version of chrome://settings.
@@ skipping 82 matching lines @@
 // Enables or disables PIN quick unlock settings integration.
 const base::Feature kQuickUnlockPin{"QuickUnlockPin",
                                     base::FEATURE_DISABLED_BY_DEFAULT};
 
 // Enables or disables emoji, handwriting and voice input on opt-in IME menu.
 const base::Feature kEHVInputOnImeMenu{"EmojiHandwritingVoiceInput",
                                        base::FEATURE_DISABLED_BY_DEFAULT};
 #endif  // defined(OS_CHROMEOS)
 
 }  // namespace features