Simpler return value from HashTable::add()/HashMap::add() and others

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 1a1b6d5f8102b02fcd7fdb6584124f711878e974..cf16660a6b045b4a2b1d4b08e4effbe9b3232974 100644
--- 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.