Use default_args for configuring V8

build_overrides/v8.gni

Index: build_overrides/v8.gni
diff --git a/build_overrides/v8.gni b/build_overrides/v8.gni
index a6370713b334a2c5ab7ec79921197744a6d3206a..d67fd16d90f462ee06c4c6895ae366359dbf4087 100644
--- a/build_overrides/v8.gni
+++ b/build_overrides/v8.gni
@@ -2,26 +2,7 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-# V8 extras
-# Adding V8 extras files requires API owners review
+# This file should be empty.
 
-# This list is for files that export symbols that are used in other extras
-# files. Putting them here causes them to be executed first during snapshot
-# creation.
-_v8_extras_dependencies =
-    [ "//third_party/WebKit/Source/core/streams/CommonStrings.js" ]
-
-_v8_extras = [
-  "//third_party/WebKit/Source/core/streams/ByteLengthQueuingStrategy.js",
-  "//third_party/WebKit/Source/core/streams/CountQueuingStrategy.js",
-  "//third_party/WebKit/Source/core/streams/ReadableStream.js",
-]
-
-v8_extra_library_files = _v8_extras_dependencies + _v8_extras
-
-v8_experimental_extra_library_files =
-    [ "//third_party/WebKit/Source/core/streams/WritableStream.js" ]
-
-v8_enable_inspector_override = true
-v8_enable_gdbjit_default = false
-v8_imminent_deprecation_warnings_default = false
+# TODO(brettw) http://crbug.com/684096 Remove this when all callers are updated
+# to use the new build overrides system.