Fix path to omnibox_focus_state.h

In change https://codereview.chromium.org/1224203003 the path to
omnibox_focus_state.h was set to a non-existent location. This isn't
a serious problem because it's just a header file. This mistake isn't
detected when generating ninja files from .gyp files unless msvs-ninja
is selected as one of the GYP_GENERATORS.

With msvs-ninja the error is revealed with this message:
Warning: Missing input files:
D:\src\chromium\src\components\omnibox\omnibox_focus_state.h

[email protected]
BUG=483424

Review URL: https://codereview.chromium.org/1240713002

Cr-Commit-Position: refs/heads/master@{#338733}
diff --git a/components/omnibox.gypi b/components/omnibox.gypi
index c8fe51e..907d316c 100644
--- a/components/omnibox.gypi
+++ b/components/omnibox.gypi
@@ -120,7 +120,7 @@
       ],
       'sources': [
         # Note: sources list duplicated in GN build.
-        'components/omnibox/omnibox_focus_state.h',
+        'omnibox/common/omnibox_focus_state.h',
       ],
     },
     {