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

third_party/WebKit/Source/platform/exported/WebString.cpp

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 15 matching lines @@
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "public/platform/WebString.h"
 
 #include "wtf/text/AtomicString.h"
 #include "wtf/text/CString.h"
 #include "wtf/text/StringUTF8Adaptor.h"
-#include "wtf/text/StringView.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
 void WebString::reset()
 {
     m_private.reset();
 }
 
 void WebString::assign(const WebString& other)
@@ skipping 80 matching lines @@
 {
     assign(s.impl());
     return *this;
 }
 
 WebString::operator WTF::String() const
 {
     return m_private.get();
 }
 
-WebString::operator WTF::StringView() const
-{
-    return StringView(m_private.get());
-}
-
 WebString::WebString(const WTF::AtomicString& s)
 {
     assign(s.getString());
 }
 
 WebString& WebString::operator=(const WTF::AtomicString& s)
 {
     assign(s.getString());
     return *this;
 }
 
 WebString::operator WTF::AtomicString() const
 {
     return WTF::AtomicString(m_private.get());
 }
 
 void WebString::assign(WTF::StringImpl* p)
 {
     m_private = p;
 }
 
 } // namespace blink