Move //components/omnibox into //components/omnibox/browser

//chrome/common/omnibox_focus_state.h needs to be componentized, as it is used
by //chrome/browser/ui/omnibox code. As it's also used by //chrome/renderer, it
needs to be componentized into //components/omnibox/common so that DEPS
allowances/build dependencies have the expected structure (i.e., don't allow
for bleed between renderer and browser code).

BUG=371536
TBR=sky

Review URL: https://codereview.chromium.org/1229613004

Cr-Commit-Position: refs/heads/master@{#338007}
diff --git a/chrome/browser/about_flags.cc b/chrome/browser/about_flags.cc
index 2e5036a..1f4302fe 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -30,7 +30,7 @@
 #include "components/dom_distiller/core/dom_distiller_switches.h"
 #include "components/metrics/metrics_hashes.h"
 #include "components/nacl/common/nacl_switches.h"
-#include "components/omnibox/omnibox_switches.h"
+#include "components/omnibox/browser/omnibox_switches.h"
 #include "components/plugins/common/plugins_switches.h"
 #include "components/proximity_auth/switches.h"
 #include "components/search/search_switches.h"