[ios] Adds configuration helper files for voice search.

ios/public/provider/chrome/browser/voice/voice_search_language.mm

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#import "ios/public/provider/chrome/browser/voice/voice_search_language.h"
+
+#include "base/mac/objc_property_releaser.h"
+
+@implementation VoiceSearchLanguage {
+  base::mac::ObjCPropertyReleaser _propertyReleaser_VoiceSearchLanguage;
+}
+
+@synthesize identifier = _identifier;
+@synthesize displayName = _displayName;
+@synthesize localizationPreference = _localizationPreference;
+
+- (instancetype)init {
+  if ((self = [super init])) {
+    _propertyReleaser_VoiceSearchLanguage.Init(self,
+                                               [VoiceSearchLanguage class]);
+  }
+  return self;
+}
+
+@end