Workaround: Wrap IBusText with ibus namespace.

chromeos/dbus/ibus/ibus_text_unittest.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.
 // TODO(nona): Add more tests.
 
 #include "chromeos/dbus/ibus/ibus_text.h"
 
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "chromeos/dbus/ibus/ibus_object.h"
 #include "dbus/message.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace chromeos {
+// TODO(nona): Remove ibus namespace after complete libibus removal.
+namespace ibus {
 
 TEST(IBusTextTest, WriteReadTest) {
   const char kSampleText[] = "Sample Text";
   const IBusText::UnderlineAttribute kSampleUnderlineAttribute1 = {
     IBusText::IBUS_TEXT_UNDERLINE_SINGLE, 10, 20};
 
   const IBusText::UnderlineAttribute kSampleUnderlineAttribute2 = {
     IBusText::IBUS_TEXT_UNDERLINE_DOUBLE, 11, 21};
 
   const IBusText::UnderlineAttribute kSampleUnderlineAttribute3 = {
@@ skipping 20 matching lines @@
 
   // Read from Response object.
   dbus::MessageReader reader(response.get());
   IBusText expected_text;
   ASSERT_TRUE(PopIBusText(&reader, &expected_text));
   EXPECT_EQ(expected_text.text(), kSampleText);
   EXPECT_EQ(3U, expected_text.underline_attributes().size());
   EXPECT_EQ(1U, expected_text.selection_attributes().size());
 }
 
+}  // namespace ibus
 }  // namespace chromeos