Rename AutocompleteProviderDelegate to AutocompleteProviderClient

Per request by [email protected] (https://codereview.chromium.org/500023002/)

BUG=388515
[email protected]

Review URL: https://codereview.chromium.org/510783002

Cr-Commit-Position: refs/heads/master@{#292333}
diff --git a/components/omnibox.gypi b/components/omnibox.gypi
index 3ea704a..3d073f5 100644
--- a/components/omnibox.gypi
+++ b/components/omnibox.gypi
@@ -36,7 +36,7 @@
         'omnibox/autocomplete_match_type.h',
         'omnibox/autocomplete_provider.cc',
         'omnibox/autocomplete_provider.h',
-        'omnibox/autocomplete_provider_delegate.h',
+        'omnibox/autocomplete_provider_client.h',
         'omnibox/autocomplete_provider_listener.h',
         'omnibox/autocomplete_result.cc',
         'omnibox/autocomplete_result.h',