Fix path to omnibox_focus_state.h
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

R=pkasting@chromium.org
BUG=483424

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

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#338733}

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