Rewrite std::string("") to std::string(), Linux edition.

ppapi/tests/test_ime_input_event.cc

 // Copyright (c) 2012 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 "ppapi/tests/test_ime_input_event.h"
 
 #include "ppapi/c/dev/ppb_ime_input_event_dev.h"
 #include "ppapi/c/dev/ppb_testing_dev.h"
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/c/ppb_input_event.h"
@@ skipping 339 matching lines @@
   segments.push_back(0U);
   segments.push_back(3U);
   segments.push_back(6U);
   segments.push_back(9U);
   pp::InputEvent update_event = CreateImeCompositionUpdateEvent(
       kCompositionText, segments, 1, std::make_pair(3U, 6U));
 
   expected_events_.clear();
   expected_events_.push_back(CreateImeCompositionStartEvent());
   expected_events_.push_back(update_event);
-  expected_events_.push_back(CreateImeCompositionEndEvent(""));
+  expected_events_.push_back(CreateImeCompositionEndEvent(std::string()));
 
   // Simulate the case when IME canceled composition.
   ASSERT_TRUE(SimulateInputEvent(update_event));
-  ASSERT_TRUE(SimulateInputEvent(CreateImeCompositionEndEvent("")));
+  ASSERT_TRUE(SimulateInputEvent(CreateImeCompositionEndEvent(std::string())));
 
   ASSERT_TRUE(expected_events_.empty());
   PASS();
 }
 
 std::string TestImeInputEvent::TestImeUnawareCommit() {
   GetFocusBySimulatingMouseClick();
 
   input_event_interface_->ClearInputEventRequest(instance_->pp_instance(),
                                                  PP_INPUTEVENT_CLASS_IME);
@@ skipping 35 matching lines @@
   segments.push_back(3U);
   segments.push_back(6U);
   segments.push_back(9U);
   pp::InputEvent update_event = CreateImeCompositionUpdateEvent(
       kCompositionText, segments, 1, std::make_pair(3U, 6U));
 
   expected_events_.clear();
 
   // Test for IME-unaware plugins. Cancel won't issue any events.
   ASSERT_TRUE(SimulateInputEvent(update_event));
-  ASSERT_TRUE(SimulateInputEvent(CreateImeCompositionEndEvent("")));
+  ASSERT_TRUE(SimulateInputEvent(CreateImeCompositionEndEvent(std::string())));
 
   ASSERT_TRUE(expected_events_.empty());
   PASS();
 }