Don't reuse the minidump descriptor for the crash signal pipe.

components/crash/content/app/crash_reporter_client.cc

 // Copyright 2013 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.
 
 #include "components/crash/content/app/crash_reporter_client.h"
 
 #include "build/build_config.h"
 
 // On Windows don't use FilePath and logging.h.
 // http://crbug.com/604923
@@ skipping 115 matching lines @@
 bool CrashReporterClient::ReportingIsEnforcedByPolicy(bool* breakpad_enabled) {
   return false;
 }
 #endif
 
 #if defined(OS_ANDROID)
 int CrashReporterClient::GetAndroidMinidumpDescriptor() {
   return 0;
 }
 
+int CrashReporterClient::GetAndroidCrashSignalFD() {
+  return -1;
+}
+
 bool CrashReporterClient::ShouldEnableBreakpadMicrodumps() {
 // Always enable microdumps on Android when stripping unwind tables. Rationale:
 // when unwind tables are stripped out (to save binary size) the stack traces
 // produced locally in the case of a crash / CHECK are meaningless. In order to
 // provide meaningful development diagnostics (and keep the binary size savings)
 // on Android we attach a secondary crash handler which serializes a reduced
 // form of logcat on the console.
 #if defined(NO_UNWIND_TABLES)
   return true;
 #else
   return false;
 #endif
 }
 #endif
 
 bool CrashReporterClient::EnableBreakpadForProcess(
     const std::string& process_type) {
   return false;
 }
 
 }  // namespace crash_reporter