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 7d9e4a3379d3e55d2b7943d3151788d7117efd92..7f1936e560e537264f47cf36ee355d97ce8c6f50 100644
--- a/chromecast/browser/cast_content_browser_client.cc
+++ b/chromecast/browser/cast_content_browser_client.cc
@@ -458,18 +458,8 @@ void CastContentBrowserClient::GetAdditionalMappedFilesForChildProcess(
       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