Switch webkit_unit_tests to use the new test launcher.

Source/web/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/ui.gni")
 import("//third_party/WebKit/Source/bindings/bindings.gni")
 import("//third_party/WebKit/Source/config.gni")
 import("//third_party/WebKit/Source/core/core.gni")
 import("//third_party/WebKit/Source/modules/modules.gni")
 import("//third_party/WebKit/Source/platform/platform.gni")
@@ skipping 72 matching lines @@
     "//third_party/libwebp",
     "//third_party/zlib",
     "//url",
     "//v8",
 # "//content/test:test_support",
 # webkit_unit_test_resources
    ]
 
   sources = [ "tests/RunAllTests.cpp" ]
 
-  if (is_component_build) {
-    defines = [ "BLINK_DLL_UNITTEST" ]
-  } else {
+  if (!is_component_build) {
     deps += [ "//third_party/WebKit/Source/core" ]
 
     configs += [ "//third_party/WebKit/Source:inside_blink" ]
 
     sources += web_gypi.web_unittest_files
     sources += bindings_unittest_files
     sources += core_unittest_files
     sources += modules_unittest_files
     sources += platform_web_unittest_files
   }
 }
 }