Make URLRequestContextBuilderV8 Mojo-only.

chrome/utility/BUILD.gn

Index: chrome/utility/BUILD.gn
diff --git a/chrome/utility/BUILD.gn b/chrome/utility/BUILD.gn
index f190c82e37438d97dc9a99971979adc144539f81..5dab674eeeb6ee721528c704cd9497dab45557ef 100644
--- a/chrome/utility/BUILD.gn
+++ b/chrome/utility/BUILD.gn
@@ -50,6 +50,7 @@ static_library("utility") {
     "//extensions/features",
     "//ipc",
     "//media",
+    "//net:net_utility_services",

[mmenke, 2017/06/07 19:18:38]

This isn't a real dependency, but gn --check doesn't handle platform #ifdefs
properly, and now that we have a "net:net_utility_services" on Android, gn
--check doesn't like including files from it (even protected by #ifdefs) without
depending on the target.

See https://crbug.com/730719

     "//net:net_with_v8",
     "//printing/features",
     "//services/service_manager/public/cpp",
@@ -94,7 +95,6 @@ static_library("utility") {
     deps += [
       "//chrome/common:mojo_bindings",
       "//chrome/common/importer:interfaces",
-      "//net:net_utility_services",
       "//services/data_decoder:lib",
     ]
   }