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

third_party/crashpad/crashpad/util/misc/random_string.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 "util/misc/random_string.h"
+
+#include "base/rand_util.h"
+
+namespace crashpad {
+
+std::string RandomString() {
+  std::string random_string;
+  for (int index = 0; index < 16; ++index) {
+    random_string.append(1, static_cast<char>(base::RandInt('A', 'Z')));
+  }
+  return random_string;
+}
+
+}  // namespace crashpad