Remove old wtf/ directory.

third_party/WebKit/Source/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("config.gni")
 if (is_clang) {
   import("//build/config/clang/clang.gni")
 }
 
 visibility = [ "//third_party/WebKit/*" ]
@@ skipping 61 matching lines @@
     } else if (is_mac) {
       precompiled_source = "//third_party/WebKit/Source/build/mac/Prefix.h"
     }
   }
 }
 
 # config -----------------------------------------------------------------------
 
 config("config") {
   include_dirs = [
-    # crbug.com/691465: Temporary solution to fix an issue related to MSVC-
-    # specific #include search order. This essentially lets
-    # #include "wtf/Foo.h" actually include "platform/wtf/Foo.h". This is okay
-    # because these files are equivalent if both exist.
-    "platform",
     ".",
     "..",
     "$root_gen_dir/blink",
     "$root_gen_dir/third_party/WebKit",
   ]
 
   cflags = []
   defines = []
 
   if (is_win) {
@@ skipping 66 matching lines @@
 
 # The follow configs apply to all targets except for unit tests, which rely on
 # static initializers.
 config("non_test_config") {
   cflags = []
 
   if (is_clang) {
     cflags += [ "-Wglobal-constructors" ]
   }
 }