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

third_party/WebKit/Source/core/layout/LayoutText.cpp

Index: third_party/WebKit/Source/core/layout/LayoutText.cpp
diff --git a/third_party/WebKit/Source/core/layout/LayoutText.cpp b/third_party/WebKit/Source/core/layout/LayoutText.cpp
index e31a90b05632a29d8d140d6e39d3a84fbcde154e..b26375c0b0d0af02b5fd696d85bf770430c1844d 100644
--- a/third_party/WebKit/Source/core/layout/LayoutText.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutText.cpp
@@ -1720,10 +1720,10 @@ void ApplyTextTransform(const ComputedStyle* style,
       MakeCapitalized(&text, previous_character);
       break;
     case ETextTransform::kUppercase:
-      text = text.Upper(style->Locale());
+      text = text.UpperUnicode(style->Locale());
       break;
     case ETextTransform::kLowercase:
-      text = text.Lower(style->Locale());
+      text = text.LowerUnicode(style->Locale());
       break;
   }
 }