[DevTools] Reduce API surface of String16.

third_party/WebKit/Source/platform/v8_inspector/V8StackTraceImpl.cpp

 // 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.
 
 #include "platform/v8_inspector/V8StackTraceImpl.h"
 
 #include "platform/inspector_protocol/Platform.h"
 #include "platform/inspector_protocol/String16.h"
 #include "platform/v8_inspector/V8Debugger.h"
 #include "platform/v8_inspector/V8StringUtil.h"
@@ skipping 238 matching lines @@
 
 String16 V8StackTraceImpl::toString() const
 {
     String16Builder stackTrace;
     for (size_t i = 0; i < m_frames.size(); ++i) {
         const Frame& frame = m_frames[i];
         stackTrace.append("\n    at " + (frame.functionName().length() ? frame.functionName() : "(anonymous function)"));
         stackTrace.append(" (");
         stackTrace.append(frame.sourceURL());
         stackTrace.append(':');
-        stackTrace.appendNumber(frame.lineNumber());
+        stackTrace.append(String16::fromInteger(frame.lineNumber()));
         stackTrace.append(':');
-        stackTrace.appendNumber(frame.columnNumber());
+        stackTrace.append(String16::fromInteger(frame.columnNumber()));
         stackTrace.append(')');
     }
     return stackTrace.toString();
 }
 
 } // namespace blink