Split //ios/public/provider/chrome/browser/* targets.

ios/public/provider/chrome/browser/voice/BUILD.gn

Index: ios/public/provider/chrome/browser/voice/BUILD.gn
diff --git a/ios/public/provider/chrome/browser/voice/BUILD.gn b/ios/public/provider/chrome/browser/voice/BUILD.gn
index 4f160a7a3b1a24f6b95ec457ef5ba8b02282f2c6..02e838ac1b7705a5286a4c8dc32a3a5aad6d2794 100644
--- a/ios/public/provider/chrome/browser/voice/BUILD.gn
+++ b/ios/public/provider/chrome/browser/voice/BUILD.gn
@@ -2,13 +2,38 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+source_set("voice") {
+  sources = [
+    "audio_session_controller.h",
+    "logo_animation_controller.h",
+    "voice_search_bar.h",
+    "voice_search_bar_owner.h",
+    "voice_search_controller.h",
+    "voice_search_controller.mm",
+    "voice_search_controller_delegate.h",
+    "voice_search_language.h",
+    "voice_search_language.mm",
+    "voice_search_prefs.cc",
+    "voice_search_prefs.h",
+    "voice_search_presenter.h",
+    "voice_search_provider.h",
+    "voice_search_provider.mm",
+  ]
+  deps = [
+    "//base",
+  ]
+}
+
 source_set("test_support") {
   sources = [
     "test_audio_session_controller.cc",
     "test_audio_session_controller.h",
+    "test_voice_search_provider.h",
+    "test_voice_search_provider.mm",
   ]
 
   deps = [
+    ":voice",
     "//base",
     "//ios/public/provider/chrome/browser",
   ]