[Extensions] Add missing build deps

Extensions relies upon the mojo bindings for resource_coordinator and
egagement. Add these explicitly to the BUILD.gn file.

Bug: 857027
Change-Id: I2e6a8c99ec6eda77a31c3747ba66d807809ae8f4
Reviewed-on: https://chromium-review.googlesource.com/1122972Reviewed-by: Istiaque Ahmed <lazyboy@chromium.org>
Commit-Queue: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#571980}

chrome/browser/extensions/BUILD.gn

@@ -802,8 +802,10 @@ jumbo_static_library("extensions") {
     "//chrome/app/theme:theme_resources",
     "//chrome/app/vector_icons",
     "//chrome/browser/devtools",
+    "//chrome/browser/engagement:mojo_bindings",
     "//chrome/browser/media/router",
     "//chrome/browser/media/router/discovery",
+    "//chrome/browser/resource_coordinator:mojo_bindings",
     "//chrome/browser/safe_browsing",
     "//chrome/common",
     "//chrome/common/extensions:mojo_bindings",