Refactor CrashDump*Manager to use a shared CrashDumpObserver singleton.

chrome/browser/chrome_browser_main_android.h

Index: chrome/browser/chrome_browser_main_android.h
diff --git a/chrome/browser/chrome_browser_main_android.h b/chrome/browser/chrome_browser_main_android.h
index e2026b53a2f9c9cee7e0906efc424852b36963e8..c946b722eee5bfb2cb4d0a6d9d16aebc204d695f 100644
--- a/chrome/browser/chrome_browser_main_android.h
+++ b/chrome/browser/chrome_browser_main_android.h
@@ -9,7 +9,7 @@
 #include "chrome/browser/chrome_browser_main.h"
 
 namespace breakpad {
-class CrashDumpManager;
+class CrashDumpObserver;
 }
 
 class ChromeBrowserMainPartsAndroid : public ChromeBrowserMainParts {
@@ -29,7 +29,7 @@ class ChromeBrowserMainPartsAndroid : public ChromeBrowserMainParts {
 
  private:
   std::unique_ptr<base::MessageLoop> main_message_loop_;
-  std::unique_ptr<breakpad::CrashDumpManager> crash_dump_manager_;
+  std::unique_ptr<breakpad::CrashDumpObserver> crash_dump_observer_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeBrowserMainPartsAndroid);
 };