[DevTools] Reduce API surface of String16.

third_party/WebKit/Source/platform/v8_inspector/V8ConsoleMessage.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/V8ConsoleMessage.h"
 
 #include "platform/v8_inspector/InspectedContext.h"
 #include "platform/v8_inspector/V8ConsoleAgentImpl.h"
 #include "platform/v8_inspector/V8InspectorImpl.h"
 #include "platform/v8_inspector/V8InspectorSessionImpl.h"
@@ skipping 66 matching lines @@
             return true;
         if (value->IsString())
             return append(v8::Local<v8::String>::Cast(value));
         if (value->IsStringObject())
             return append(v8::Local<v8::StringObject>::Cast(value)->ValueOf());
         if (value->IsSymbol())
             return append(v8::Local<v8::Symbol>::Cast(value));
         if (value->IsSymbolObject())
             return append(v8::Local<v8::SymbolObject>::Cast(value)->ValueOf());
         if (value->IsNumberObject()) {
-            m_builder.appendNumber(v8::Local<v8::NumberObject>::Cast(value)->ValueOf());
+            m_builder.append(String16::fromDoublePrecision6(v8::Local<v8::NumberObject>::Cast(value)->ValueOf()));
             return true;
         }
         if (value->IsBooleanObject()) {
             m_builder.append(v8::Local<v8::BooleanObject>::Cast(value)->ValueOf() ? "true" : "false");
             return true;
         }
         if (value->IsArray())
             return append(v8::Local<v8::Array>::Cast(value));
         if (value->IsProxy()) {
             m_builder.append("[object Proxy]");
@@ skipping 326 matching lines @@
         session->releaseObjectGroup("console");
 }
 
 void V8ConsoleMessageStorage::contextDestroyed(int contextId)
 {
     for (size_t i = 0; i < m_messages.size(); ++i)
         m_messages[i]->contextDestroyed(contextId);
 }
 
 } // namespace blink