Remove redundant DocumentLoadTiming references.

Source/core/dom/IdleCallbackDeadline.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 IdleCallbackDeadline_h
 #define IdleCallbackDeadline_h
 
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
-class DocumentLoadTiming;
-
 class IdleCallbackDeadline : public GarbageCollected<IdleCallbackDeadline>, public ScriptWrappable {
     DEFINE_WRAPPERTYPEINFO();
-
 public:
     enum class CallbackType {
         CalledWhenIdle,
         CalledByTimeout
     };
 
-    DEFINE_INLINE_TRACE() {}
-    static IdleCallbackDeadline* create(double deadlineMillis, CallbackType callbackType, const DocumentLoadTiming& timing)
+    static IdleCallbackDeadline* create(double deadlineSeconds, CallbackType callbackType)
     {
-        return new IdleCallbackDeadline(deadlineMillis, callbackType, timing);
+        return new IdleCallbackDeadline(deadlineSeconds, callbackType);
     }
 
+    DEFINE_INLINE_TRACE() { }
+
     double timeRemaining() const;
 
     bool didTimeout() const
     {
         return m_callbackType == CallbackType::CalledByTimeout;
     }
 
 private:
-    IdleCallbackDeadline(double deadlineMillis, CallbackType, const DocumentLoadTiming&);
+    IdleCallbackDeadline(double deadlineSeconds, CallbackType);
 
-    double m_deadlineMillis;
+    double m_deadlineSeconds;
     CallbackType m_callbackType;
-    const DocumentLoadTiming& m_timing;
 };
-}
+
+} // namespace blink
 
 #endif // IdleCallbackDeadline_h