Copy Crashpad into the Chrome tree instead of importing it via DEPS

third_party/crashpad/crashpad/handler/main.cc

+// Copyright 2015 The Crashpad Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "handler/handler_main.h"
+
+#include "build/build_config.h"
+#include "tools/tool_support.h"
+
+#if defined(OS_MACOSX)
+int main(int argc, char* argv[]) {
+  return crashpad::HandlerMain(argc, argv);
+}
+#elif defined(OS_WIN)
+int wmain(int argc, wchar_t* argv[]) {
+  return crashpad::ToolSupport::Wmain(argc, argv, crashpad::HandlerMain);
+}
+#endif  // OS_MACOSX