Add a new mechanism for watching SVGElement 'href' targets

third_party/WebKit/Source/core/svg/SVGMPathElement.h

Index: third_party/WebKit/Source/core/svg/SVGMPathElement.h
diff --git a/third_party/WebKit/Source/core/svg/SVGMPathElement.h b/third_party/WebKit/Source/core/svg/SVGMPathElement.h
index 5aeb32dafd1b8ef313e9f59eb9aefc31b5f50c05..112043af67f6ecb5a64ad34e423208f10221a456 100644
--- a/third_party/WebKit/Source/core/svg/SVGMPathElement.h
+++ b/third_party/WebKit/Source/core/svg/SVGMPathElement.h
@@ -20,7 +20,6 @@
 #ifndef SVGMPathElement_h
 #define SVGMPathElement_h
 
-#include "core/SVGNames.h"
 #include "core/svg/SVGElement.h"
 #include "core/svg/SVGURIReference.h"
 
@@ -55,6 +54,8 @@ class SVGMPathElement final : public SVGElement, public SVGURIReference {
 
   bool layoutObjectIsNeeded(const ComputedStyle&) override { return false; }
   void notifyParentOfPathChange(ContainerNode*);
+
+  Member<IdTargetObserver> m_targetIdObserver;
 };
 
 }  // namespace blink