Use base::string16 for CompositionText.Text instead of converting to utf-8 and back unnecessarily.

chrome/browser/chromeos/input_method/input_method_engine_browsertests.cc

 // Copyright 2013 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 "ash/ime/input_method_menu_item.h"
 #include "ash/ime/input_method_menu_manager.h"
 #include "base/bind_helpers.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/extensions/extension_browsertest.h"
 #include "chrome/browser/extensions/extension_test_message_listener.h"
@@ skipping 452 matching lines @@
     ASSERT_TRUE(content::ExecuteScript(host->host_contents(),
                                        set_composition_test_script));
     EXPECT_EQ(1, mock_input_context->update_preedit_text_call_count());
 
     EXPECT_EQ(4U,
               mock_input_context->last_update_composition_arg().cursor_pos);
     EXPECT_TRUE(mock_input_context->last_update_composition_arg().is_visible);
 
     const CompositionText& composition_text =
         mock_input_context->last_update_composition_arg().composition_text;
-    EXPECT_EQ("COMPOSITION_TEXT", composition_text.text());
+    EXPECT_EQ(base::UTF8ToUTF16("COMPOSITION_TEXT"), composition_text.text());
     const std::vector<CompositionText::UnderlineAttribute>& underlines =
         composition_text.underline_attributes();
 
     ASSERT_EQ(2U, underlines.size());
     EXPECT_EQ(CompositionText::COMPOSITION_TEXT_UNDERLINE_SINGLE,
               underlines[0].type);
     EXPECT_EQ(0U, underlines[0].start_index);
     EXPECT_EQ(5U, underlines[0].end_index);
 
     EXPECT_EQ(CompositionText::COMPOSITION_TEXT_UNDERLINE_DOUBLE,
@@ skipping 410 matching lines @@
     }
   }
 
   IMEBridge::Get()->SetInputContextHandler(NULL);
   IMEBridge::Get()->SetCandidateWindowHandler(NULL);
 }
 
 }  // namespace
 }  // namespace input_method
 }  // namespace chromeos