Use explicit WebString conversions in LayoutTest related files

components/test_runner/spell_check_client.cc

 // Copyright 2014 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/spell_check_client.h"
 
 #include <stddef.h>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 82 matching lines @@
     return;
   last_requested_text_checking_completion_->didCancelCheckingText();
   last_requested_text_checking_completion_ = nullptr;
 }
 
 void SpellCheckClient::FinishLastTextCheck() {
   if (!last_requested_text_checking_completion_)
     return;
   std::vector<blink::WebTextCheckingResult> results;
   int offset = 0;
-  base::string16 text = last_requested_text_check_string_;
-  if (!spell_check_.IsMultiWordMisspelling(blink::WebString(text), &results)) {
+  if (!spell_check_.IsMultiWordMisspelling(last_requested_text_check_string_,
+                                           &results)) {
+    base::string16 text = last_requested_text_check_string_.utf16();
     while (text.length()) {
       int misspelled_position = 0;
       int misspelled_length = 0;
-      spell_check_.SpellCheckWord(
-          blink::WebString(text), &misspelled_position, &misspelled_length);
+      spell_check_.SpellCheckWord(blink::WebString::fromUTF16(text),
+                                  &misspelled_position, &misspelled_length);
       if (!misspelled_length)
         break;
       blink::WebVector<blink::WebString> suggestions;
       spell_check_.FillSuggestionList(
-          blink::WebString(text.substr(misspelled_position, misspelled_length)),
+          blink::WebString::fromUTF16(
+              text.substr(misspelled_position, misspelled_length)),
           &suggestions);
       results.push_back(blink::WebTextCheckingResult(
           blink::WebTextDecorationTypeSpelling,
           offset + misspelled_position,
           misspelled_length,
           suggestions.isEmpty() ? blink::WebString() : suggestions[0]));
       text = text.substr(misspelled_position + misspelled_length);
       offset += misspelled_position + misspelled_length;
     }
     MockGrammarCheck::CheckGrammarOfString(last_requested_text_check_string_,
@@ skipping 32 matching lines @@
     return;
 
   v8::Context::Scope context_scope(context);
 
   frame->callFunctionEvenIfScriptDisabled(
       v8::Local<v8::Function>::New(isolate, resolved_callback_),
       context->Global(), 0, nullptr);
 }
 
 }  // namespace test_runner