Revert of Crashpad Windows: Use the Crashpad client instead of Breakpad on Windows

components/crash/core/common/crash_keys.h

 // 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.
 
 #ifndef COMPONENTS_CRASH_CORE_COMMON_CRASH_KEYS_H_
 #define COMPONENTS_CRASH_CORE_COMMON_CRASH_KEYS_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 30 matching lines @@
 const size_t kMediumSize = kSmallSize * 4;
 
 // A large crash key, which will be chunked on all platforms. This should be
 // used sparingly.
 const size_t kLargeSize = kSmallSize * 16;
 
 // Crash Key Name Constants ////////////////////////////////////////////////////
 
 // The GUID used to identify this client to the crash system.
 #if defined(OS_MACOSX)
-// When using Crashpad, the crash reporting client ID is the responsibility of
-// Crashpad. It is not set directly by Chrome. To make the metrics client ID
-// available on the server, it's stored in a distinct key.
+// On Mac OS X, the crash reporting client ID is the responsibility of Crashpad.
+// It is not set directly by Chrome. To make the metrics client ID available on
+// the server, it's stored in a distinct key.
 extern const char kMetricsClientId[];
-#elif defined(OS_WIN)
-extern const char kMetricsClientId[];
-extern const char kClientId[];
 #else
 // When using Breakpad instead of Crashpad, the crash reporting client ID is the
 // same as the metrics client ID.
 extern const char kClientId[];
 #endif
 
 // The product release/distribution channel.
 extern const char kChannel[];
 
 // The total number of experiments the instance has.
@@ skipping 13 matching lines @@
 // deliberate crash.
 extern const char kZombie[];
 extern const char kZombieTrace[];
 
 }  // namespace mac
 #endif
 
 }  // namespace crash_keys
 
 #endif  // COMPONENTS_CRASH_CORE_COMMON_CRASH_KEYS_H_