Update some uses of char16 to use the base:: namespace.

ui/views/controls/textfield/native_textfield_views_unittest.cc

Index: ui/views/controls/textfield/native_textfield_views_unittest.cc
diff --git a/ui/views/controls/textfield/native_textfield_views_unittest.cc b/ui/views/controls/textfield/native_textfield_views_unittest.cc
index aa926a7a97e9c73cb1ea01f14f360b719771c9c4..a0376e5ddffcd353452c627c14bd2ee2a3907e8c 100644
--- a/ui/views/controls/textfield/native_textfield_views_unittest.cc
+++ b/ui/views/controls/textfield/native_textfield_views_unittest.cc
@@ -47,7 +47,7 @@
 
 namespace {
 
-const char16 kHebrewLetterSamekh = 0x05E1;
+const base::char16 kHebrewLetterSamekh = 0x05E1;
 
 // A Textfield wrapper to intercept OnKey[Pressed|Released]() ressults.
 class TestTextfield : public views::Textfield {
@@ -232,7 +232,7 @@ class NativeTextfieldViewsTest : public ViewsTestBase,
     SendKeyEvent(key_code, false, false);
   }
 
-  void SendKeyEvent(char16 ch) {
+  void SendKeyEvent(base::char16 ch) {
     if (ch < 0x80) {
       ui::KeyboardCode code =
           ch == ' ' ? ui::VKEY_SPACE :
@@ -1804,7 +1804,7 @@ TEST_F(NativeTextfieldViewsTest, GetCompositionCharacterBoundsTest) {
 TEST_F(NativeTextfieldViewsTest, GetCompositionCharacterBounds_ComplexText) {
   InitTextfield(Textfield::STYLE_DEFAULT);
 
-  const char16 kUtf16Chars[] = {
+  const base::char16 kUtf16Chars[] = {
     // U+0020 SPACE
     0x0020,
     // U+1F408 (CAT) as surrogate pair