Remove the lifetime hack in ImageLoader where it keeps its assoc element alive

third_party/WebKit/Source/core/loader/ImageLoader.h

Index: third_party/WebKit/Source/core/loader/ImageLoader.h
diff --git a/third_party/WebKit/Source/core/loader/ImageLoader.h b/third_party/WebKit/Source/core/loader/ImageLoader.h
index 4898446af2cdcee88aef2c42cc7d63b547deb88d..6fce9b95a1ca6f4f83cf78478f1745550fc35bb0 100644
--- a/third_party/WebKit/Source/core/loader/ImageLoader.h
+++ b/third_party/WebKit/Source/core/loader/ImageLoader.h
@@ -134,8 +134,6 @@ private:
     void crossSiteOrCSPViolationOccurred(AtomicString);
     void enqueueImageLoadingMicroTask(UpdateFromElementBehavior, ReferrerPolicy);
 
-    void timerFired(TimerBase*);
-
     KURL imageSourceToKURL(AtomicString) const;
 
     // Used to determine whether to immediately initiate the load
@@ -151,12 +149,7 @@ private:
 
     Member<Element> m_element;
     Member<ImageResource> m_image;
-    // FIXME: Oilpan: We might be able to remove this Persistent hack when
-    // ImageResourceClient is traceable.
-    GC_PLUGIN_IGNORE("http://crbug.com/383741")
-    Persistent<Element> m_keepAlive;
 
-    Timer<ImageLoader> m_derefElementTimer;
     AtomicString m_failedLoadURL;
     WeakPtr<Task> m_pendingTask; // owned by Microtask
     std::unique_ptr<IncrementLoadEventDelayCount> m_loadDelayCounter;
@@ -164,7 +157,6 @@ private:
     bool m_hasPendingErrorEvent : 1;
     bool m_imageComplete : 1;
     bool m_loadingImageDocument : 1;
-    bool m_elementIsProtected : 1;
     bool m_suppressErrorEvents : 1;
 };