Enable registerProtocolHandler on Linux

build/common.gypi

 # Copyright (c) 2011 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.
 
 # IMPORTANT:
 # Please don't directly include this file if you are building via gyp_chromium,
 # since gyp_chromium is automatically forcing its inclusion.
 {
   # Variables expected to be overriden on the GYP command line (-D) or by
   # ~/.gyp/include.gypi.
@@ skipping 131 matching lines @@
       # If this is set, the clang plugins used on the buildbot will be used.
       # Run tools/clang/scripts/update.sh to make sure they are compiled.
       # This causes 'clang_chrome_plugins_flags' to be set.
       # Has no effect if 'clang' is not set as well.
       'clang_use_chrome_plugins%': 0,
 
       # Set to 1 compile with -fPIC cflag on linux. This is a must for shared
       # libraries on linux x86-64 and arm, plus ASLR.
       'linux_fpic%': 1,
 
+      # Enable navigator.registerProtocolHandler and supporting UI.
+      'enable_register_protocol_handler%': 1,
+
       'conditions': [
         # Use Skia as WebKit renderer on Mac
         ['OS=="mac"', {
           'use_skia%': 0,
         }, {
           'use_skia%': 1,
         }],
 
         # A flag for POSIX platforms
         ['OS=="win"', {
@@ skipping 32 matching lines @@
         }, {
           'enable_flapper_hacks%': 0,
         }],
 
         # Enable file manager extension by default on Chrome OS.
         ['chromeos==1', {
           'file_manager_extension%': 1,
         }, {
           'file_manager_extension%': 0,
         }],
-
-        # Enable navigator.registerProtocolHandler and supporting UI.
-        # We disable on Linux because the OS-level component of RPH isn't
-        # implemented.
-        ['OS=="linux"', {
-          'enable_register_protocol_handler%': 0,
-        }, {
-          'enable_register_protocol_handler%': 1,
-        }],
       ],
     },
 
     # Copy conditionally-set variables out one scope.
     'branding%': '<(branding)',
     'buildtype%': '<(buildtype)',
     'target_arch%': '<(target_arch)',
     'host_arch%': '<(host_arch)',
     'library%': 'static_library',
     'toolkit_views%': '<(toolkit_views)',
@@ skipping 1555 matching lines @@
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }
 
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