Refactor CrashDump*Manager to use a shared CrashDumpObserver singleton.

chromecast/browser/cast_content_browser_client.cc

Index: chromecast/browser/cast_content_browser_client.cc
diff --git a/chromecast/browser/cast_content_browser_client.cc b/chromecast/browser/cast_content_browser_client.cc
index 7e21f0d417e4914f4415ea8c4428873309d53f7c..6f8cf77dfc476f152ba378d0925409034c44a761 100644
--- a/chromecast/browser/cast_content_browser_client.cc
+++ b/chromecast/browser/cast_content_browser_client.cc
@@ -468,19 +468,8 @@ void CastContentBrowserClient::GetAdditionalMappedFilesForChildProcess(
       kAndroidPakDescriptor,
       base::GlobalDescriptors::GetInstance()->Get(kAndroidPakDescriptor),
       base::GlobalDescriptors::GetInstance()->GetRegion(kAndroidPakDescriptor));
-
-  if (breakpad::IsCrashReporterEnabled()) {
-    base::File minidump_file(
-        breakpad::CrashDumpManager::GetInstance()->CreateMinidumpFile(
-            child_process_id));
-    if (!minidump_file.IsValid()) {
-      LOG(ERROR) << "Failed to create file for minidump, crash reporting will "
-                 << "be disabled for this process.";
-    } else {
-      mappings->Transfer(kAndroidMinidumpDescriptor,
-                         base::ScopedFD(minidump_file.TakePlatformFile()));
-    }
-  }
+  breakpad::CrashDumpObserver::GetInstance()->BrowserChildProcessStarted(
+      child_process_id, mappings);
 #else
     int crash_signal_fd = GetCrashSignalFD(command_line);
   if (crash_signal_fd >= 0) {