Add suggestions to the deps of chrome/browser/ui

The proto is used by some headers and the lack of dependency is causing some build flakiness.

TBR=dpranke

Review URL: https://codereview.chromium.org/887193003

Cr-Commit-Position: refs/heads/master@{#314050}

chrome/browser/ui/BUILD.gn

@@ -98,6 +98,7 @@ static_library("ui") {
       "//chrome/installer/util",
       "//components/autofill/content/browser:risk_proto",
       "//components/power",
+      "//components/suggestions/proto",
       "//device/nfc",
       "//media",
       "//net:net_with_v8",