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 2b44625f151cf7d7cec3ed9b1aad65cb1f8d6d9c..4a2f09a42d78f557ae9edc5504da5d0a3cdebe18 100644
--- a/content/shell/browser/shell_content_browser_client.cc
+++ b/content/shell/browser/shell_content_browser_client.cc
@@ -343,18 +343,8 @@ void ShellContentBrowserClient::GetAdditionalMappedFilesForChildProcess(
   regions->insert(std::make_pair(
       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);
 }
 #elif defined(OS_POSIX) && !defined(OS_MACOSX)
 void ShellContentBrowserClient::GetAdditionalMappedFilesForChildProcess(