DevTools: simplify JSONValues API, prepare to the OwnPtr migration.

third_party/WebKit/Source/platform/v8_inspector/V8DebuggerAgentImpl.cpp

 // Copyright 2015 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/V8DebuggerAgentImpl.h"
 
 #include "platform/JSONValues.h"
 #include "platform/v8_inspector/AsyncCallChain.h"
 #include "platform/v8_inspector/IgnoreExceptionsScope.h"
 #include "platform/v8_inspector/InjectedScript.h"
@@ skipping 1437 matching lines @@
     m_scripts.set(parsedScript.scriptId, script);
 
     if (scriptURL.isEmpty() || !parsedScript.success)
         return;
 
     RefPtr<JSONObject> breakpointsCookie = m_state->getObject(DebuggerAgentState::javaScriptBreakpoints);
     if (!breakpointsCookie)
         return;
 
     for (auto& cookie : *breakpointsCookie) {
-        RefPtr<JSONObject> breakpointObject = cookie.value->asObject();
+        RefPtr<JSONObject> breakpointObject = JSONObject::cast(cookie.value);
         bool isRegex;
         breakpointObject->getBoolean(DebuggerAgentState::isRegex, &isRegex);
         String url;
         breakpointObject->getString(DebuggerAgentState::url, &url);
         if (!matches(m_debugger, scriptURL, url, isRegex))
             continue;
         ScriptBreakpoint breakpoint;
         breakpointObject->getNumber(DebuggerAgentState::lineNumber, &breakpoint.lineNumber);
         breakpointObject->getNumber(DebuggerAgentState::columnNumber, &breakpoint.columnNumber);
         breakpointObject->getString(DebuggerAgentState::condition, &breakpoint.condition);
@@ skipping 154 matching lines @@
     m_scripts.clear();
     m_blackboxedPositions.clear();
     m_breakpointIdToDebuggerBreakpointIds.clear();
     resetAsyncCallTracker();
     m_promiseTracker->clear();
     if (m_frontend)
         m_frontend->globalObjectCleared();
 }
 
 } // namespace blink