Revert of Add CHECK()s about ImageLoader::has_pending_load_event_

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

Index: third_party/WebKit/Source/core/loader/ImageLoader.cpp
diff --git a/third_party/WebKit/Source/core/loader/ImageLoader.cpp b/third_party/WebKit/Source/core/loader/ImageLoader.cpp
index b0fc819f4cbcb87768ad6e22b8d81b104fe5ecb9..74f02520228e0228d8772d8930f9f31b99fff916 100644
--- a/third_party/WebKit/Source/core/loader/ImageLoader.cpp
+++ b/third_party/WebKit/Source/core/loader/ImageLoader.cpp
@@ -519,16 +519,6 @@
   DCHECK(failed_load_url_.IsEmpty());
   DCHECK_EQ(resource, image_.Get());
 
-  // |has_pending_load_event_| is always false and |image_complete_| is
-  // always true for entire ImageDocument loading for historical reason.
-  // DoUpdateFromElement() is not called and SetImageForImageDocument()
-  // is called instead for ImageDocument loading.
-  // TODO(hiroshige): Turn the CHECK()s to DCHECK()s before going to beta.
-  if (loading_image_document_)
-    CHECK(image_complete_);
-  else
-    CHECK(!image_complete_);
-
   image_complete_ = true;
 
   // Update ImageAnimationPolicy for image_.
@@ -541,12 +531,8 @@
     ToSVGImage(image_->GetImage())
         ->UpdateUseCounters(GetElement()->GetDocument());
 
-  if (loading_image_document_) {
-    CHECK(!has_pending_load_event_);
-    return;
-  }
-
-  CHECK(has_pending_load_event_);
+  if (!has_pending_load_event_)
+    return;
 
   if (resource->ErrorOccurred()) {
     LoadEventSender().CancelEvent(this);
@@ -646,10 +632,10 @@
 }
 
 void ImageLoader::DispatchPendingLoadEvent() {
-  CHECK(has_pending_load_event_);
+  if (!has_pending_load_event_)
+    return;
   if (!image_)
     return;
-  CHECK(image_complete_);
   has_pending_load_event_ = false;
   if (GetElement()->GetDocument().GetFrame())
     DispatchLoadEvent();
@@ -661,7 +647,8 @@
 }
 
 void ImageLoader::DispatchPendingErrorEvent() {
-  CHECK(has_pending_error_event_);
+  if (!has_pending_error_event_)
+    return;
   has_pending_error_event_ = false;
 
   if (GetElement()->GetDocument().GetFrame())