Revert of Expand WTF::StringView's API to be more like StringPiece.

third_party/WebKit/Source/wtf/text/WTFString.h

Index: third_party/WebKit/Source/wtf/text/WTFString.h
diff --git a/third_party/WebKit/Source/wtf/text/WTFString.h b/third_party/WebKit/Source/wtf/text/WTFString.h
index f82c71f42f944e65d20e90d357898ef3a42b44db..8d01437df9b2314a390c9d56513ad6af83386194 100644
--- a/third_party/WebKit/Source/wtf/text/WTFString.h
+++ b/third_party/WebKit/Source/wtf/text/WTFString.h
@@ -30,6 +30,7 @@
 #include "wtf/WTFExport.h"
 #include "wtf/text/ASCIIFastPath.h"
 #include "wtf/text/StringImpl.h"
+#include "wtf/text/StringView.h"
 #include <algorithm>
 #include <iosfwd>
 
@@ -341,6 +342,9 @@
     String substring(unsigned pos, unsigned len = UINT_MAX) const;
     String left(unsigned len) const { return substring(0, len); }
     String right(unsigned len) const { return substring(length() - len, len); }
+
+    StringView createView() const { return StringView(impl()); }
+    StringView createView(unsigned offset, unsigned length) const { return StringView(impl(), offset, length); }
 
     // Returns a lowercase/uppercase version of the string
     String lower() const;