[DevTools] Move link click and context menu handling to Linkifier.

third_party/WebKit/Source/devtools/front_end/platform/DOMExtension.js

Index: third_party/WebKit/Source/devtools/front_end/platform/DOMExtension.js
diff --git a/third_party/WebKit/Source/devtools/front_end/platform/DOMExtension.js b/third_party/WebKit/Source/devtools/front_end/platform/DOMExtension.js
index 3ae4256b849c6f78674f00bfc621bb2f891db59e..2a2cb03bd15e6062cdea6878f92a303e2264fb94 100644
--- a/third_party/WebKit/Source/devtools/front_end/platform/DOMExtension.js
+++ b/third_party/WebKit/Source/devtools/front_end/platform/DOMExtension.js
@@ -246,7 +246,11 @@ Node.prototype.parentElementOrShadowHost = function() {
  * @return {?Node}
  */
 Node.prototype.parentNodeOrShadowHost = function() {
-  return this.parentNode || this.host || null;
+  if (this.parentNode)
+    return this.parentNode;
+  if (this.nodeType === Node.DOCUMENT_FRAGMENT_NODE && this.host)
+    return this.host;
+  return null;
 };
 
 /**