[filesapp] Remove unused SWA files app main.css

With CL:2536584 the SWA files app main.html is auto-generated from the
files app main.html and provides its own CSS files. Thus, SWA main.css
file is no longer used: remove it.

Bug: 1113981
Change-Id: I88a7d0a02c10993f7c3113425466827f046939dd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2540146
Auto-Submit: Noel Gordon <noel@chromium.org>
Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
Commit-Queue: Noel Gordon <noel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827938}

chromeos/components/file_manager/file_manager_ui.cc

@@ -27,7 +27,6 @@ FileManagerUI::FileManagerUI(content::WebUI* web_ui,
 
   // The resources requested by chrome://file-manager HTML.
   // TOD(majewski): Rename main.* to main_swa.*
-  source->AddResourcePath("main.css", IDR_FILE_MANAGER_SWA_MAIN_CSS);
   source->AddResourcePath("main.js", IDR_FILE_MANAGER_SWA_MAIN_JS);
   source->AddResourcePath("file_manager.mojom-lite.js",
                           IDR_FILE_MANAGER_SWA_MOJO_LITE_JS);

chromeos/components/file_manager/resources/file_manager_resources.grd

@@ -16,7 +16,6 @@
         <!-- Privileged app host contents. -->
         <include name="IDR_FILE_MANAGER_SWA_BROWSER_PROXY_JS" file="browser_proxy.js" type="BINDATA" />
         <include name="IDR_FILE_MANAGER_SWA_MAIN_HTML" file="${root_gen_dir}/chromeos/components/file_manager/resources/main.html" flattenhtml="true" use_base_dir="false" type="BINDATA" />
-        <include name="IDR_FILE_MANAGER_SWA_MAIN_CSS" file="main.css" type="BINDATA" />
         <include name="IDR_FILE_MANAGER_SWA_MAIN_JS" file="main.js" type="BINDATA" />
         <include name="IDR_FILE_MANAGER_SWA_ICON_192" file="images/icon192.png" type="BINDATA" />
 

chromeos/components/file_manager/resources/main.css

-/* Copyright (c) 2020 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. */