Add missing dependencies

In https://ci.chromium.org/p/chrome/builders/official/mac64/1623:

chrome/browser/extensions/api/omnibox/omnibox_api.h includes
components/omnibox/browser/autocomplete_match.h includes
components/omnibox/browser/buildflags.h

This fails due to three bad dependencies.

1. autocomplete_match.h includes buildflags.h, and is included
   from code outside of components/omnibox/browser so buildflags.h
   must be a public_deps
2. omnibox_api.h includes autocomplete_match.h so it must
   declare it in deps
3. because omnibox_api.h is further included outside of
   chrome/browser/extensions/api/omnibox, its inclusion of
   autocomplete_match.h means that autocomplete_match.h
   must be a public_deps

(Thanks to rockot@ for the help.)

Bug: 1130293
Change-Id: Ic08fbc648c9fed70e853b4c8ab1478fe4626a933
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2436575Reviewed-by: Tommy Li <tommycli@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Commit-Queue: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811798}

chrome/browser/extensions/BUILD.gn

@@ -740,6 +740,7 @@ static_library("extensions") {
     "//chrome/browser/extensions/api:api_registration",
     "//chrome/common",
     "//chrome/common/extensions/api",
+    "//components/omnibox/browser",
     "//components/safe_browsing/core:csd_proto",
     "//components/safe_browsing/core:webprotect_proto",
     "//components/safe_browsing/core/db:util",
@@ -807,7 +808,6 @@ static_library("extensions") {
     "//components/nacl/common:buildflags",
     "//components/navigation_interception",
     "//components/net_log",
-    "//components/omnibox/browser",
     "//components/onc",
     "//components/page_load_metrics/browser:browser",
     "//components/password_manager/core/browser",

chrome/browser/extensions/api/BUILD.gn

@@ -27,6 +27,7 @@ function_registration("api_registration") {
 
     # Different APIs include headers from these targets.
     "//chrome/common:mojo_bindings",
+    "//components/omnibox/browser",
     "//components/zoom",
     "//content/public/browser",
     "//extensions/browser",

components/omnibox/browser/BUILD.gn

@@ -208,6 +208,7 @@ static_library("browser") {
   ]
 
   public_deps = [
+    ":buildflags",
     ":location_bar",
     "//base",
     "//base:i18n",
@@ -219,7 +220,6 @@ static_library("browser") {
     "//url",
   ]
   deps = [
-    ":buildflags",
     ":in_memory_url_index_cache_proto",
     "//components/bookmarks/browser",
     "//components/component_updater",