Make `getComputedStyle` return the correct style for collapsed <img> elements.

third_party/WebKit/Source/core/html/HTMLImageElement.h

Index: third_party/WebKit/Source/core/html/HTMLImageElement.h
diff --git a/third_party/WebKit/Source/core/html/HTMLImageElement.h b/third_party/WebKit/Source/core/html/HTMLImageElement.h
index 40fef19356d7cd2a4513ee934c72933acb76ec58..a77fab31a6fe63ae446089aabd1a6cd7d0658dff 100644
--- a/third_party/WebKit/Source/core/html/HTMLImageElement.h
+++ b/third_party/WebKit/Source/core/html/HTMLImageElement.h
@@ -114,6 +114,7 @@ class CORE_EXPORT HTMLImageElement final
   virtual void ensureCollapsedOrFallbackContent();
   virtual void ensureFallbackForGeneratedContent();
   virtual void ensurePrimaryContent();
+  bool isCollapsed() const;
 
   // CanvasImageSource implementation
   PassRefPtr<Image> getSourceImageForCanvas(SourceImageStatus*,
@@ -187,7 +188,6 @@ class CORE_EXPORT HTMLImageElement final
   void setLayoutDisposition(LayoutDisposition, bool forceReattach = false);
 
   void attachLayoutTree(const AttachContext& = AttachContext()) override;
-  bool layoutObjectIsNeeded(const ComputedStyle&) override;
   LayoutObject* createLayoutObject(const ComputedStyle&) override;
 
   bool canStartSelection() const override { return false; }