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

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

 /*
  * (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012, 2013 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 12 matching lines @@
 #define WTFString_h
 
 // This file would be called String.h, but that conflicts with <string.h>
 // on systems without case-sensitive file systems.
 
 #include "wtf/Allocator.h"
 #include "wtf/HashTableDeletedValueType.h"
 #include "wtf/WTFExport.h"
 #include "wtf/text/ASCIIFastPath.h"
 #include "wtf/text/StringImpl.h"
-#include "wtf/text/StringView.h"
 #include <algorithm>
 #include <iosfwd>
 
 #ifdef __OBJC__
 #include <objc/objc.h>
 #endif
 
 namespace WTF {
 
 class CString;
@@ skipping 292 matching lines @@
 
     void ensure16Bit();
 
     void truncate(unsigned len);
     void remove(unsigned pos, int len = 1);
 
     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;
     String upper() const;
 
     String lower(const AtomicString& localeIdentifier) const;
     String upper(const AtomicString& localeIdentifier) const;
 
     String stripWhiteSpace() const;
     String stripWhiteSpace(IsWhiteSpaceFunctionPtr) const;
     String simplifyWhiteSpace(StripBehavior = StripExtraWhiteSpace) const;
@@ skipping 350 matching lines @@
 using WTF::charactersToFloat;
 using WTF::equal;
 using WTF::equalIgnoringCase;
 using WTF::find;
 using WTF::isAllSpecialCharacters;
 using WTF::isSpaceOrNewline;
 using WTF::reverseFind;
 
 #include "wtf/text/AtomicString.h"
 #endif // WTFString_h