Refactor CrashDump*Manager to use a shared CrashDumpObserver.

chromecast/browser/cast_browser_main_parts.h

Index: chromecast/browser/cast_browser_main_parts.h
diff --git a/chromecast/browser/cast_browser_main_parts.h b/chromecast/browser/cast_browser_main_parts.h
index d60960472b4ea21bd601075112f6ed06c70f17d9..62699a4c9e9eecb5ed344e228c1c4f2dfa95dffc 100644
--- a/chromecast/browser/cast_browser_main_parts.h
+++ b/chromecast/browser/cast_browser_main_parts.h
@@ -17,6 +17,12 @@ class SingleThreadTaskRunner;
 class Thread;
 }  // namespace base
 
+#if defined(OS_ANDROID)
+namespace breakpad {
+class CrashDumpObserver;
+}
+#endif
+
 namespace net {
 class NetLog;
 }
@@ -82,6 +88,10 @@ class CastBrowserMainParts : public content::BrowserMainParts {
   std::unique_ptr<CastMemoryPressureMonitor> memory_pressure_monitor_;
 #endif
 
+#if defined(OS_ANDROID)
+  std::unique_ptr<breakpad::CrashDumpObserver> crash_dump_observer_;
+#endif
+
   DISALLOW_COPY_AND_ASSIGN(CastBrowserMainParts);
 };