Replace two ASSERT()s for HashMap iterators with DCHECK_NE()s.

third_party/WebKit/Source/core/events/EventPath.cpp

Index: third_party/WebKit/Source/core/events/EventPath.cpp
diff --git a/third_party/WebKit/Source/core/events/EventPath.cpp b/third_party/WebKit/Source/core/events/EventPath.cpp
index 5347b62cf18070216d145f7fc49bd055883a5330..67bcb31871732b7e1fc5b34cf7077a71ac6fc35a 100644
--- a/third_party/WebKit/Source/core/events/EventPath.cpp
+++ b/third_party/WebKit/Source/core/events/EventPath.cpp
@@ -186,8 +186,7 @@ void EventPath::calculateTreeOrderAndSetNearestAncestorClosedTree()
             rootTree = treeScopeEventContext.get();
             continue;
         }
-        // TODO(tkent): Add a stream printer for HashMap::iterator.
-        ASSERT(treeScopeEventContextMap.find(parent) != treeScopeEventContextMap.end());
+        DCHECK_NE(treeScopeEventContextMap.find(parent), treeScopeEventContextMap.end());
         treeScopeEventContextMap.find(parent)->value->addChild(*treeScopeEventContext.get());
     }
     DCHECK(rootTree);