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

third_party/crashpad/crashpad/doc/index.ad

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+// 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.
+
+:doctype: article
+
+= Crashpad
+
+https://crashpad.chromium.org/[Crashpad] is a crash-reporting system.
+
+== Documentation
+
+ * link:status.html[Project status]
+ * link:developing.html[Developing Crashpad]: instructions for getting the
+   source code, building, testing, and contributing to the project.
+ * https://crashpad.chromium.org/doxygen/index.html[Crashpad interface
+   documentation]
+ * https://crashpad.chromium.org/man/index.html[Crashpad tool man pages]
+
+== Source Code
+
+Crashpad’s source code is hosted in a Git repository at
+https://chromium.googlesource.com/crashpad/crashpad.
+
+== Other Links
+
+ * Bugs can be reported at the https://crashpad.chromium.org/bug/[Crashpad issue
+   tracker].
+ * The https://build.chromium.org/p/client.crashpad[Crashpad Buildbot] performs
+   automated builds and tests.
+ * https://groups.google.com/a/chromium.org/group/crashpad-dev[crashpad-dev] is
+   the Crashpad developers’ mailing list.