Reduce code verbosity in passing invalidation rect to cc.

BUG=529938

Review URL: https://codereview.chromium.org/1643523006

Cr-Commit-Position: refs/heads/master@{#372235}

third_party/WebKit/Source/platform/graphics/paint/PaintArtifact.cpp

@@ -96,10 +96,8 @@ void PaintArtifact::appendToWebDisplayItemList(WebDisplayItemList* list) const
 #if ENABLE(ASSERT)
     m_displayItemList.assertDisplayItemClientsAreAlive();
 #endif
-    for (const DisplayItem& displayItem : m_displayItemList) {
-        IntRect visualRect = displayItem.client().visualRect();
-        displayItem.appendToWebDisplayItemList(visualRect, list);
-    }
+    for (const DisplayItem& displayItem : m_displayItemList)
+        displayItem.appendToWebDisplayItemList(displayItem.client().visualRect(), list);
 }
 
 } // namespace blink