Roll libwebm 75a6d2d:9a235e0

third_party/libwebm/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.
 
+config("libwebm_config") {
+  include_dirs = [ "./source" ]
+}
+
 source_set("libwebm") {
+  configs += [ ":libwebm_config" ]
+  public_configs = [ ":libwebm_config" ]
+
+  if (!is_win) {
+    cflags = [ "-Wno-deprecated-declarations" ]  # libwebm uses std::auto_ptr
+  }
+
   sources = [
-    "source/mkvmuxer.cpp",
-    "source/mkvmuxerutil.cpp",
-    "source/mkvwriter.cpp",
+    "source/mkvmuxer/mkvmuxer.cc",
+    "source/mkvmuxer/mkvmuxerutil.cc",
+    "source/mkvmuxer/mkvwriter.cc",
   ]
 }