(Concept patch) Simplify WTF::HashTable::add() return value for size and performance

Source/core/page/EventHandler.cpp

Index: Source/core/page/EventHandler.cpp
diff --git a/Source/core/page/EventHandler.cpp b/Source/core/page/EventHandler.cpp
index c6c5a70987acb60a90b99bea6bda6d7faa59b87d..36e5193ce6de88740620cf52d0c51660233b3e06 100755
--- a/Source/core/page/EventHandler.cpp
+++ b/Source/core/page/EventHandler.cpp
@@ -3715,8 +3715,10 @@ bool EventHandler::handleTouchEvent(const PlatformTouchEvent& event)
 
         // Ensure this target's touch list exists, even if it ends up empty, so it can always be passed to TouchEvent::Create below.
         TargetTouchesMap::iterator targetTouchesIterator = touchesByTarget.find(touchTarget.get());
-        if (targetTouchesIterator == touchesByTarget.end())
-            targetTouchesIterator = touchesByTarget.set(touchTarget.get(), TouchList::create()).iterator;
+        if (targetTouchesIterator == touchesByTarget.end()) {
+            touchesByTarget.set(touchTarget.get(), TouchList::create());
+            targetTouchesIterator = touchesByTarget.find(touchTarget.get());
+        }
 
         // touches and targetTouches should only contain information about touches still on the screen, so if this point is
         // released or cancelled it will only appear in the changedTouches list.