Refactor CrashDump*Manager to use a shared CrashDumpObserver singleton.

content/shell/browser/shell_content_browser_client.cc

Index: content/shell/browser/shell_content_browser_client.cc
diff --git a/content/shell/browser/shell_content_browser_client.cc b/content/shell/browser/shell_content_browser_client.cc
index 323544ffdb2a3a9f9468ce6e7552da703e0ab51d..27f3b297b0d41406fe0446b0de473ec28dba852f 100644
--- a/content/shell/browser/shell_content_browser_client.cc
+++ b/content/shell/browser/shell_content_browser_client.cc
@@ -341,18 +341,8 @@ void ShellContentBrowserClient::GetAdditionalMappedFilesForChildProcess(
       base::GlobalDescriptors::GetInstance()->Get(kShellPakDescriptor),
       base::GlobalDescriptors::GetInstance()->GetRegion(kShellPakDescriptor));
 
-  if (breakpad::IsCrashReporterEnabled()) {
-    base::File f(breakpad::CrashDumpManager::GetInstance()->CreateMinidumpFile(
-        child_process_id));
-    if (!f.IsValid()) {
-      LOG(ERROR) << "Failed to create file for minidump, crash reporting will "
-                 << "be disabled for this process.";
-    } else {
-      mappings->Transfer(kAndroidMinidumpDescriptor,
-                         base::ScopedFD(f.TakePlatformFile()));
-    }
-  }
-
+  breakpad::CrashDumpObserver::GetInstance()->BrowserChildProcessStarted(
+      child_process_id, mappings);
 #else
   int crash_signal_fd = GetCrashSignalFD(command_line);
   if (crash_signal_fd >= 0) {