Update GN build files for new prefs location.

Updates references from //base:prefs to //components/prefs/

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Review URL: https://codereview.chromium.org/1652573002

Cr-Commit-Position: refs/heads/master@{#372540}
diff --git a/components/feedback/BUILD.gn b/components/feedback/BUILD.gn
index ec4e9f19..0a017a01 100644
--- a/components/feedback/BUILD.gn
+++ b/components/feedback/BUILD.gn
@@ -54,10 +54,10 @@
   deps = [
     ":feedback",
     "//base",
-    "//base:prefs_test_support",
     "//components/feedback/proto",
     "//components/keyed_service/core",
     "//components/pref_registry:test_support",
+    "//components/prefs:test_support",
     "//components/user_prefs",
     "//components/variations/net",
     "//content/test:test_support",