Enable registerProtocolHandler on Linux

build/common.gypi

Index: build/common.gypi
diff --git a/build/common.gypi b/build/common.gypi
index 75f1e5f5b39e2e0c22b655f5eb9c4a55cefb3288..b45913a38cd846fab8cb03e6d11bba8e4f297d9c 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -149,6 +149,9 @@
       # 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"', {
@@ -201,15 +204,6 @@
         }, {
           '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,
-        }],
       ],
     },