Refactor CrashDump*Manager to use a shared CrashDumpObserver singleton.

content/shell/browser/shell_browser_main_parts.h

Index: content/shell/browser/shell_browser_main_parts.h
diff --git a/content/shell/browser/shell_browser_main_parts.h b/content/shell/browser/shell_browser_main_parts.h
index e245404a09471fbd8bef69a16c53abe158b62e38..24f426835999b8914c36ac709640513a1e5ae648 100644
--- a/content/shell/browser/shell_browser_main_parts.h
+++ b/content/shell/browser/shell_browser_main_parts.h
@@ -13,12 +13,6 @@
 #include "content/public/common/main_function_params.h"
 #include "content/shell/browser/shell_browser_context.h"
 
-#if defined(OS_ANDROID)
-namespace breakpad {
-class CrashDumpManager;
-}
-#endif
-
 namespace net {
 class NetLog;
 }
@@ -61,9 +55,6 @@ class ShellBrowserMainParts : public BrowserMainParts {
   }
 
  private:
-#if defined(OS_ANDROID)
-  std::unique_ptr<breakpad::CrashDumpManager> crash_dump_manager_;
-#endif
   std::unique_ptr<net::NetLog> net_log_;
   std::unique_ptr<ShellBrowserContext> browser_context_;
   std::unique_ptr<ShellBrowserContext> off_the_record_browser_context_;