Switch RegularExpression from YARR to V8

Source/core/html/BaseTextInputType.cpp

Index: Source/core/html/BaseTextInputType.cpp
diff --git a/Source/core/html/BaseTextInputType.cpp b/Source/core/html/BaseTextInputType.cpp
index 9a9540f70035465b5eab3d57c83b1dd8526df30b..fd9c9e5b748ad7c458ac641039637b4bacb9c57b 100644
--- a/Source/core/html/BaseTextInputType.cpp
+++ b/Source/core/html/BaseTextInputType.cpp
@@ -44,9 +44,12 @@ bool BaseTextInputType::patternMismatch(const String& value) const
     if (rawPattern.isNull() || value.isEmpty())
         return false;
     String pattern = "^(" + rawPattern + ")$";
+    RegularExpression regex(pattern, TextCaseSensitive);
+    if (!regex.isValid())

[adamk, 2013/04/22 17:48:03]

There are other uses of RegularExpression; is there a reason not to update them
too with an isValid call? It looks like you just added this check for clarity,
not correctness?

+        return false;
     int matchLength = 0;
     int valueLength = value.length();
-    int matchOffset = RegularExpression(pattern, TextCaseSensitive).match(value, 0, &matchLength);
+    int matchOffset = regex.match(value, 0, &matchLength);
     return matchOffset || matchLength != valueLength;
 }