[iOS] Clean deps and public_deps.

ios/chrome/browser/voice/BUILD.gn

Index: ios/chrome/browser/voice/BUILD.gn
diff --git a/ios/chrome/browser/voice/BUILD.gn b/ios/chrome/browser/voice/BUILD.gn
index 2803373f1240b0cd86a2dbc4df9a1098f6b83701..f40c064b7fa1492953222513b831620571c0dfab 100644
--- a/ios/chrome/browser/voice/BUILD.gn
+++ b/ios/chrome/browser/voice/BUILD.gn
@@ -14,12 +14,9 @@ source_set("voice") {
   ]
 
   deps = [
+    "//base",
     "//components/pref_registry",
     "//components/prefs",
-  ]
-
-  public_deps = [
-    "//base",
     "//ios/public/provider/chrome/browser",
     "//ios/public/provider/chrome/browser/voice",
   ]
@@ -73,14 +70,11 @@ source_set("unit_tests") {
   ]
 
   deps = [
+    ":tts",
     "//base",
     "//ios/web",
     "//ios/web:test_support",
     "//testing/gtest",
     "//third_party/google_toolbox_for_mac",
   ]
-
-  public_deps = [
-    ":tts",
-  ]
 }