Fix ::first-letter not to apply non-block containers

third_party/WebKit/Source/core/layout/LayoutObject.h

Index: third_party/WebKit/Source/core/layout/LayoutObject.h
diff --git a/third_party/WebKit/Source/core/layout/LayoutObject.h b/third_party/WebKit/Source/core/layout/LayoutObject.h
index ae8d7805bd1f4b4606a4cebc8aae601315f7f79e..cef8ef1a279f3757243cf20cc8e294f15cd80a5c 100644
--- a/third_party/WebKit/Source/core/layout/LayoutObject.h
+++ b/third_party/WebKit/Source/core/layout/LayoutObject.h
@@ -889,10 +889,13 @@ class CORE_EXPORT LayoutObject : public ImageResourceObserver,
   // first-line, first-letter and text-overflow.
   // The flex box and grid specs require that flex box and grid do not
   // support first-line|first-letter, though.
+  // When LayoutObject and display do not agree, allow first-line|first-letter
+  // only when both indicate it's a block container.
   // TODO(cbiesinger): Remove when buttons are implemented with align-items
   // instead of flex box. crbug.com/226252.
   bool behavesLikeBlockContainer() const {
-    return isLayoutBlockFlow() || isLayoutButton();
+    return (isLayoutBlockFlow() && style()->isDisplayBlockContainer()) ||
+           isLayoutButton();
   }
 
   // May be optionally passed to container() and various other similar methods