Workaround: Wrap IBusText with ibus namespace.

chromeos/dbus/ibus/ibus_text_unittest.cc

Index: chromeos/dbus/ibus/ibus_text_unittest.cc
diff --git a/chromeos/dbus/ibus/ibus_text_unittest.cc b/chromeos/dbus/ibus/ibus_text_unittest.cc
index 87fbff1f1d580cc31b3df72840654eac1e4c36a0..cc1afbffca950edb471438f7926b0b25f7206f5d 100644
--- a/chromeos/dbus/ibus/ibus_text_unittest.cc
+++ b/chromeos/dbus/ibus/ibus_text_unittest.cc
@@ -16,6 +16,8 @@
 #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";
@@ -56,4 +58,5 @@ TEST(IBusTextTest, WriteReadTest) {
   EXPECT_EQ(1U, expected_text.selection_attributes().size());
 }
 
+}  // namespace ibus
 }  // namespace chromeos