Add "Unicode" suffixes to some functions of WTF::String and WTF::StringImpl.

third_party/WebKit/Source/platform/wtf/text/StringImpl.h

Index: third_party/WebKit/Source/platform/wtf/text/StringImpl.h
diff --git a/third_party/WebKit/Source/platform/wtf/text/StringImpl.h b/third_party/WebKit/Source/platform/wtf/text/StringImpl.h
index be9864e4c047b6f3292ef334a7fad1d830d56b69..5f2408abb0ad53249863a339b9419a0f51e21d20 100644
--- a/third_party/WebKit/Source/platform/wtf/text/StringImpl.h
+++ b/third_party/WebKit/Source/platform/wtf/text/StringImpl.h
@@ -378,12 +378,12 @@ class WTF_EXPORT StringImpl {
   double ToDouble(bool* ok = 0);
   float ToFloat(bool* ok = 0);
 
-  PassRefPtr<StringImpl> Lower();
+  PassRefPtr<StringImpl> LowerUnicode();
   PassRefPtr<StringImpl> LowerASCII();
-  PassRefPtr<StringImpl> Upper();
+  PassRefPtr<StringImpl> UpperUnicode();
   PassRefPtr<StringImpl> UpperASCII();
-  PassRefPtr<StringImpl> Lower(const AtomicString& locale_identifier);
-  PassRefPtr<StringImpl> Upper(const AtomicString& locale_identifier);
+  PassRefPtr<StringImpl> LowerUnicode(const AtomicString& locale_identifier);
+  PassRefPtr<StringImpl> UpperUnicode(const AtomicString& locale_identifier);
 
   PassRefPtr<StringImpl> Fill(UChar);
   // FIXME: Do we need fill(char) or can we just do the right thing if UChar is