Move components/startup_metric_utils/* to components/startup_metric_utils/browser/*.

This CL first landed as revision 357702. It was reverted because of an
XP-only perf regression (crbug.com/551690). After discussion with
jschuh@, it was decided that this regression can be ignored.

We are working on new startup metrics that require sending IPCs from
the renderer to the browser. The message definitions will live in
components/startup_metric_utils/common/*, while the code that receives
IPCs and logs UMA metrics will live in
components/startup_metric_utils/browser/*.

As a first step towards implementing these new metrics, this CL moves
existing code from components/startup_metric_utils/* to
components/startup_metric_utils/browser/*.

BUG=547794

Review URL: https://codereview.chromium.org/1413153010

Cr-Commit-Position: refs/heads/master@{#358636}
diff --git a/chrome/browser/ui/browser.cc b/chrome/browser/ui/browser.cc
index 29e4088e..da8bfb9 100644
--- a/chrome/browser/ui/browser.cc
+++ b/chrome/browser/ui/browser.cc
@@ -164,7 +164,7 @@
 #include "components/search/search.h"
 #include "components/sessions/core/session_types.h"
 #include "components/sessions/core/tab_restore_service.h"
-#include "components/startup_metric_utils/startup_metric_utils.h"
+#include "components/startup_metric_utils/browser/startup_metric_utils.h"
 #include "components/translate/core/browser/language_state.h"
 #include "components/ui/zoom/zoom_controller.h"
 #include "components/web_modal/web_contents_modal_dialog_manager.h"