Refactor CrashDump*Manager to use a shared CrashDumpObserver singleton.

content/shell/browser/shell_browser_main_parts.cc

Index: content/shell/browser/shell_browser_main_parts.cc
diff --git a/content/shell/browser/shell_browser_main_parts.cc b/content/shell/browser/shell_browser_main_parts.cc
index 2b7726d0660d378d12dcbc28131c0cfb8cd60607..4928be34352047055ed9f12bba5611d75fe12932 100644
--- a/content/shell/browser/shell_browser_main_parts.cc
+++ b/content/shell/browser/shell_browser_main_parts.cc
@@ -18,6 +18,7 @@
 #include "content/public/common/content_switches.h"
 #include "content/public/common/main_function_params.h"
 #include "content/public/common/url_constants.h"
+#include "content/shell/android/shell_descriptors.h"
 #include "content/shell/browser/shell.h"
 #include "content/shell/browser/shell_access_token_store.h"
 #include "content/shell/browser/shell_browser_context.h"
@@ -37,6 +38,7 @@
 #if defined(OS_ANDROID)
 #include "base/message_loop/message_loop.h"
 #include "components/crash/content/browser/crash_dump_manager_android.h"
+#include "components/crash/content/browser/crash_dump_observer_android.h"
 #include "net/android/network_change_notifier_factory_android.h"
 #include "net/base/network_change_notifier.h"
 #endif
@@ -165,12 +167,15 @@ void ShellBrowserMainParts::InitializeMessageLoopContext() {
 
 #if defined(OS_ANDROID)
 int ShellBrowserMainParts::PreCreateThreads() {
+  breakpad::CrashDumpObserver::Create();
   if (base::CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kEnableCrashReporter)) {
     base::FilePath crash_dumps_dir =
         base::CommandLine::ForCurrentProcess()->GetSwitchValuePath(
             switches::kCrashDumpsDir);
-    crash_dump_manager_.reset(new breakpad::CrashDumpManager(crash_dumps_dir));
+    breakpad::CrashDumpObserver::GetInstance()->RegisterClient(
+        base::MakeUnique<breakpad::CrashDumpManager>(
+            crash_dumps_dir, kAndroidMinidumpDescriptor));
   }
 
   return 0;