Remove useless null checks from Node::document() call sites

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 3a2002d467809ddcb859ed6955e88ba282dcffc5..1ef1a33c29ebc469d93dc881d65b2fc87697d612 100644
--- a/Source/core/page/EventHandler.cpp
+++ b/Source/core/page/EventHandler.cpp
@@ -3642,8 +3642,6 @@ bool EventHandler::handleTouchEvent(const PlatformTouchEvent& event)
                 m_originatingTouchPointDocument = doc;
                 freshTouchEvents = false;
             }
-            if (!doc)
-                continue;
             if (!doc->hasTouchEventHandlers())
                 continue;
             m_originatingTouchPointTargets.set(touchPointTargetKey, node);
@@ -3667,8 +3665,6 @@ bool EventHandler::handleTouchEvent(const PlatformTouchEvent& event)
         if (!touchTarget.get())
             continue;
         Document* doc = touchTarget->toNode()->document();
-        if (!doc)
-            continue;
         if (!doc->hasTouchEventHandlers())
             continue;
         Frame* targetFrame = doc->frame();