Remove explicit data dep on $root_out_dir/remoting/unittests/ directory.

Listing a generated directory in the isolate means that incremental
builders (and devs doing incremental builds) can have stale files in
their generated isolated files.

Since we already have data_deps on all these copy steps, the isolate
already contains an explicit list of all files in that directory, and
having a data line for the directory is not necessary. Just remove it.

Bug: 912946
Change-Id: Id7232369905fb651227d5e913247271dd39a4211
Reviewed-on: https://chromium-review.googlesource.com/c/1368584Reviewed-by: Joe Downing <joedow@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#615606}

chrome/test/BUILD.gn

@@ -1145,7 +1145,6 @@ test("browser_tests") {
       "//third_party/tlslite/",
       "//ui/webui/resources/js/",
       "$root_out_dir/browser_tests.pak",
-      "$root_out_dir/remoting/unittests/",
       "$root_out_dir/test_case.html",
       "$root_out_dir/test_case.html.mock-http-headers",
       "$root_out_dir/test_page.css",

remoting/webapp/files.gni

@@ -2,14 +2,6 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-# `7MM"""Mq.                       `7MM
-#   MM   `MM.                        MM
-#   MM   ,M9  .gP"Ya   ,6"Yb.   ,M""bMM  `7MMpMMMb.pMMMb.  .gP"Ya
-#   MMmmdM9  ,M'   Yb 8)   MM ,AP    MM    MM    MM    MM ,M'   Yb
-#   MM  YM.  8M""""""  ,pm9MM 8MI    MM    MM    MM    MM 8M""""""
-#   MM   `Mb.YM.    , 8M   MM `Mb    MM    MM    MM    MM YM.    ,
-# .JMML. .JMM.`Mbmmd' `Moo9^Yo.`Wbmd"MML..JMML  JMML  JMML.`Mbmmd'
-#
 # Please keep this file in sync with remoting/remoting_webapp_files.gypi .
 
 # JSCompiler externs.