Oilpan: Fix compile after r200678.

Source/core/inspector/V8DebuggerAgent.h

 // 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.
 
 #ifndef V8DebuggerAgent_h
 #define V8DebuggerAgent_h
 
 #include "bindings/core/v8/ScriptState.h"
 #include "bindings/core/v8/ScriptValue.h"
 #include "core/CoreExport.h"
@@ skipping 21 matching lines @@
 class JSONObject;
 class RemoteCallFrameId;
 class ScriptAsyncCallStack;
 class ScriptRegexp;
 class V8AsyncCallTracker;
 class V8Debugger;
 
 typedef String ErrorString;
 
 class CORE_EXPORT V8DebuggerAgent
-    : public V8DebuggerListener
+    : public NoBaseWillBeGarbageCollectedFinalized<V8DebuggerAgent>

[yurys, 2015/08/18 18:45:55]

This class is going to be moved out of Blink and cannot depend on Oilpan. Can we
start removing such dependencies now to avoid double work of first adding Oilpan
support for them just to remove it later?

[haraken, 2015/08/18 23:50:28]

I'm fine with it as long as you don't break oilpan builds. We had to land this
CL to fix the breakage.

+    , public V8DebuggerListener
     , public InspectorBackendDispatcher::DebuggerCommandHandler
     , public PromiseTracker::Listener {
     WTF_MAKE_NONCOPYABLE(V8DebuggerAgent);
     WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED(V8DebuggerAgent);
+    WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(V8DebuggerAgent);
 public:
     enum BreakpointSource {
         UserBreakpointSource,
         DebugCommandBreakpointSource,
         MonitorCommandBreakpointSource
     };
 
     static const char backtraceObjectGroup[];
 
     class CORE_EXPORT Client {
     public:
         virtual ~Client() { }
         virtual void debuggerAgentEnabled() = 0;
         virtual void debuggerAgentDisabled() = 0;
         virtual void muteConsole() = 0;
         virtual void unmuteConsole() = 0;
         virtual InjectedScript defaultInjectedScript() = 0;
     };
 
     V8DebuggerAgent(InjectedScriptManager*, V8Debugger*, Client*, int contextGroupId);
     ~V8DebuggerAgent() override;
+    DECLARE_TRACE();
 
     void setInspectorState(InspectorState* state) { m_state = state; }
     void setFrontend(InspectorFrontend::Debugger* frontend) { m_frontend = frontend; }
     void clearFrontend();
     void restore();
     void disable(ErrorString*) final;
 
     bool isPaused();
 
     // Part of the protocol.
@@ skipping 191 matching lines @@
     int m_currentAsyncOperationId;
     bool m_pendingTraceAsyncOperationCompleted;
     bool m_startingStepIntoAsync;
     V8GlobalValueMap<String, v8::Script, v8::kNotWeak> m_compiledScripts;
 };
 
 } // namespace blink
 
 
 #endif // V8DebuggerAgent_h