Refactor CrashDump*Manager to use a shared CrashDumpObserver singleton.

chromecast/browser/cast_browser_main_parts.cc

Index: chromecast/browser/cast_browser_main_parts.cc
diff --git a/chromecast/browser/cast_browser_main_parts.cc b/chromecast/browser/cast_browser_main_parts.cc
index 22df7643d29d8ef8f303780d6314dfff2fe0b782..3dd22c54bfd9105940a23a9759a18c12df20a730 100644
--- a/chromecast/browser/cast_browser_main_parts.cc
+++ b/chromecast/browser/cast_browser_main_parts.cc
@@ -40,6 +40,7 @@
 #include "chromecast/browser/pref_service_helper.h"
 #include "chromecast/browser/url_request_context_factory.h"
 #include "chromecast/chromecast_features.h"
+#include "chromecast/common/global_descriptors.h"
 #include "chromecast/common/platform_client_auth.h"
 #include "chromecast/media/base/key_systems_common.h"
 #include "chromecast/media/base/media_resource_tracker.h"
@@ -386,8 +387,9 @@ int CastBrowserMainParts::PreCreateThreads() {
   if (!chromecast::CrashHandler::GetCrashDumpLocation(&crash_dumps_dir)) {
     LOG(ERROR) << "Could not find crash dump location.";
   }
-  cast_browser_process_->SetCrashDumpManager(
-      base::MakeUnique<breakpad::CrashDumpManager>(crash_dumps_dir));
+  crash_dump_observer_ = base::MakeUnique<breakpad::CrashDumpObserver>();
+  crash_dump_observer_->RegisterClient(new breakpad::CrashDumpManager(
+      crash_dumps_dir, kAndroidMinidumpDescriptor));
 #else
   base::FilePath home_dir;
   CHECK(PathService::Get(DIR_CAST_HOME, &home_dir));