Oilpan: fix PromiseTracker's handling of its persistent promise wrappers.

Source/core/inspector/InspectorDebuggerAgent.h

 /*
  * Copyright (C) 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2010-2011 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 226 matching lines @@
 
     PassRefPtr<TypeBuilder::Debugger::Location> resolveBreakpoint(const String& breakpointId, const String& scriptId, const ScriptBreakpoint&, BreakpointSource);
     void removeBreakpoint(const String& breakpointId);
     void clear();
     bool assertPaused(ErrorString*);
     void clearBreakDetails();
 
     String sourceMapURLForScript(const Script&, CompileResult);
 
     PassRefPtrWillBeRawPtr<JavaScriptCallFrame> topCallFrameSkipUnknownSources(String* scriptURL, bool* isBlackboxed);
-    AsyncCallStackTracker& asyncCallStackTracker() { return *m_asyncCallStackTracker; };
+    AsyncCallStackTracker& asyncCallStackTracker() const { return *m_asyncCallStackTracker; };
+    PromiseTracker& promiseTracker() const { return *m_promiseTracker; }
 
     typedef HashMap<String, Script> ScriptsMap;
     typedef HashMap<String, Vector<String> > BreakpointIdToDebugServerBreakpointIdsMap;
     typedef HashMap<String, std::pair<String, BreakpointSource> > DebugServerBreakpointToBreakpointIdAndSourceMap;
 
     RawPtrWillBeMember<InjectedScriptManager> m_injectedScriptManager;
     InspectorFrontend::Debugger* m_frontend;
     RefPtr<ScriptState> m_pausedScriptState;
     ScriptValue m_currentCallStack;
     ScriptsMap m_scripts;
     BreakpointIdToDebugServerBreakpointIdsMap m_breakpointIdToDebugServerBreakpointIds;
     DebugServerBreakpointToBreakpointIdAndSourceMap m_serverBreakpoints;
     String m_continueToLocationBreakpointId;
     InspectorFrontend::Debugger::Reason::Enum m_breakReason;
     RefPtr<JSONObject> m_breakAuxData;
     bool m_javaScriptPauseScheduled;
     bool m_debuggerStepScheduled;
     bool m_steppingFromFramework;
     bool m_pausingOnNativeEvent;
     RawPtrWillBeMember<Listener> m_listener;
 
     int m_skippedStepInCount;
     int m_minFrameCountForSkip;
     bool m_skipAllPauses;
     bool m_skipContentScripts;
     OwnPtr<ScriptRegexp> m_cachedSkipStackRegExp;
     OwnPtrWillBeMember<AsyncCallStackTracker> m_asyncCallStackTracker;
-    PromiseTracker m_promiseTracker;
+    OwnPtrWillBeMember<PromiseTracker> m_promiseTracker;
 };
 
 } // namespace blink
 
 
 #endif // !defined(InspectorDebuggerAgent_h)