Use explicit WebString conversions in LayoutTest related files

components/test_runner/web_view_test_client.cc

 // 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.
 
 #include "components/test_runner/web_view_test_client.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/i18n/rtl.h"
 #include "base/strings/string16.h"
@@ skipping 81 matching lines @@
 
 void WebViewTestClient::showValidationMessage(
     const blink::WebRect& anchor_in_root_view,
     const blink::WebString& main_message,
     blink::WebTextDirection main_message_hint,
     const blink::WebString& sub_message,
     blink::WebTextDirection sub_message_hint) {
   if (test_runner()->is_web_platform_tests_mode())
     return;
 
-  base::string16 wrapped_main_text = main_message;
-  base::string16 wrapped_sub_text = sub_message;
+  base::string16 wrapped_main_text = main_message.utf16();
+  base::string16 wrapped_sub_text = sub_message.utf16();
 
   if (main_message_hint == blink::WebTextDirectionLeftToRight) {
     wrapped_main_text =
         base::i18n::GetDisplayStringInLTRDirectionality(wrapped_main_text);
   } else if (main_message_hint == blink::WebTextDirectionRightToLeft &&
              !base::i18n::IsRTL()) {
     base::i18n::WrapStringWithRTLFormatting(&wrapped_main_text);
   }
 
   if (!wrapped_sub_text.empty()) {
@@ skipping 24 matching lines @@
 
 void WebViewTestClient::didFocus() {
   test_runner()->SetFocus(web_view_test_proxy_base_->web_view(), true);
 }
 
 TestRunner* WebViewTestClient::test_runner() {
   return web_view_test_proxy_base_->test_interfaces()->GetTestRunner();
 }
 
 }  // namespace test_runner