Reland "Mandoline filesystem: Build the filesystem on windows."

mandoline/BUILD.gn

 # Copyright 2015 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.
 
 group("all") {
   # Meta-target, don't link into production code.
   testonly = true
 
   deps = [
     ":tests",
   ]
 
   if (!is_component_build) {
-    deps += [ "//mandoline/app" ]
-
-    if (!is_win) {
-      deps += [ "//components/filesystem" ]
-    }
+    deps += [
+      "//mandoline/app",
+      "//components/filesystem",
+    ]
   }
 }
 
 group("tests") {
   testonly = true
   deps = [
     "//mojo:tests",
   ]
 
   # TODO(GYP): Make this work.
   if (!is_component_build && !is_mac) {
     deps += [
       "//components/clipboard:apptests",
+      "//components/filesystem:apptests",
       "//components/html_viewer:apptests",
       "//components/html_viewer:tests",
       "//components/resource_provider:apptests",
       "//components/resource_provider:tests",
       "//components/view_manager:tests",
     ]
-
-    if (!is_win) {
-      deps += [ "//components/filesystem:apptests" ]
-    }
   }
 }