Fix dependency issues for proto files in browser static lib

Bug: 1100210
Change-Id: I4f87d3649f46238dcc02157050cf1690b41dde4c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2272300
Commit-Queue: Amr Aboelkher <amraboelkher@google.com>
Reviewed-by: Takuto Ikuta <tikuta@chromium.org>
Cr-Commit-Position: refs/heads/master@{#788531}

chrome/browser/BUILD.gn

@@ -1802,6 +1802,7 @@ static_library("browser") {
     "//components/autofill/core/browser",
     "//components/nacl/common:buildflags",
     "//components/payments/core",
+    "//components/policy/proto",
     "//components/safe_browsing:buildflags",
     "//components/services/storage/public/mojom",
     "//components/sync",