clean up some deps

Bug: None
Test: Locally build
Change-Id: I110dcd953372737156882f8067e7c9188760946e
Reviewed-on: https://chromium-review.googlesource.com/1109299Reviewed-by: Muyuan Li <muyuanli@chromium.org>
Commit-Queue: Xiaohui Chen <xiaohuic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#569114}

chromeos/services/assistant/BUILD.gn

@@ -66,10 +66,7 @@ source_set("lib") {
       "//chromeos/assistant/internal/action",
       "//libassistant/contrib/core",
       "//libassistant/contrib/platform/audio",
-      "//libassistant/contrib/platform/net",
-      "//libassistant/contrib/platform/resources",
       "//libassistant/shared/internal_api/c:api_wrappers_for_caller_no_chromium",
-      "//libassistant/shared/proto:assistant_proto",
       "//libassistant/shared/public",
       "//libassistant/shared/public:export",
       "//ui/base",