[DevTools] Migrate v8_inspector/public from String16 to String{View,Buffer}.

third_party/WebKit/Source/platform/v8_inspector/String16STL.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef String16STL_h
 #define String16STL_h
 
 #include <cctype>
 #include <climits>
 #include <cstdlib>
@@ skipping 24 matching lines @@
     }
 
     String16 isolatedCopy() const { return String16(m_impl); }
     const UChar* characters16() const { return m_impl.c_str(); }
     size_t length() const { return m_impl.length(); }
     bool isEmpty() const { return !m_impl.length(); }
     UChar operator[](unsigned index) const { return m_impl[index]; }
     String16 substring(unsigned pos, unsigned len = UINT_MAX) const { return String16(m_impl.substr(pos, len)); }
     size_t find(const String16& str, unsigned start = 0) const { return m_impl.find(str.m_impl, start); }
     size_t reverseFind(const String16& str, unsigned start = UINT_MAX) const { return m_impl.rfind(str.m_impl, start); }
+    void swap(String16& other) { m_impl.swap(other.m_impl); }
 
     // Convenience methods.
     std::string utf8() const;
     static String16 fromUTF8(const char* stringStart, size_t length);
 
     const std::basic_string<UChar>& impl() const { return m_impl; }
     explicit String16(const std::basic_string<UChar>& impl) : m_impl(impl) { }
 
     std::size_t hash() const
     {
@@ skipping 40 matching lines @@
 
 class InspectorProtocolConvenienceStringType {
 public:
     // This class should not be ever instantiated, so we don't implement constructors.
     InspectorProtocolConvenienceStringType();
     InspectorProtocolConvenienceStringType(const blink::protocol::String16& other);
     operator blink::protocol::String16() const { return blink::protocol::String16(); };
 };
 
 #endif // !defined(String16STL_h)