Fix LayoutTests/imported leftovers.

WATCHLISTS

 # Copyright (c) 2012 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.
 
 # Watchlist Rules
 # Refer: http://dev.chromium.org/developers/contributing-code/watchlists
 
 # IMPORTANT: The regular expression filepath is tested against each path using
 # re.search, so it is not usually necessary to add .*.
 
@@ skipping 1386 matching lines @@
                   '|third_party/WebKit/Source/modules/vibration/'
     },
     'blink_viewport_interaction': {
       'filepath': 'third_party/WebKit/Source/core/css/.*Viewport' \
                   '|third_party/WebKit/Source/core/dom/ViewportArguments' \
                   '|third_party/WebKit/Source/core/html/HTMLMetaElement' \
                   '|third_party/WebKit/Source/core/page/FrameView' \
                   '|third_party/WebKit/Source/core/page/scrolling'
     },
     'blink_w3ctests': {
-      'filepath': 'third_party/WebKit/LayoutTests/imported/' \
+      'filepath': 'third_party/WebKit/LayoutTests/external/' \
                   '|third_party/WebKit/Tools/Scripts/webkitpy/w3c/'
     },
     'blink_web': {
       'filepath': 'third_party/WebKit/Source/web'
     },
     'blink_webcomponents': {
       'filepath': 'third_party/WebKit/Source/core/dom/shadow/' \
                   '|third_party/WebKit/Source/core/dom/custom/' \
                   '|third_party/WebKit/Source/core/html/imports/' \
                   '|third_party/WebKit/Source/bindings/v8/custom/V8CustomElementConstructorCustom' \
@@ skipping 662 matching lines @@
                          'raymes+watch@chromium.org'],
     'windows_sandboxing': ['pennymac+watch@chromium.org',
                            'wfh+watch@chromium.org'],
     'x11': ['derat+watch@chromium.org',
             'sadrul@chromium.org',
             'yusukes+watch@chromium.org'],
     'xml': ['dominicc+watchlist@chromium.org'],
     'zoom': ['wjmaclean@chromium.org'],
   },
 }