WIP (Introduce WTF::NonNullPtr<T>.)

Source/core/css/CSSComputedStyleDeclaration.cpp

Index: Source/core/css/CSSComputedStyleDeclaration.cpp
diff --git a/Source/core/css/CSSComputedStyleDeclaration.cpp b/Source/core/css/CSSComputedStyleDeclaration.cpp
index dd2e82d38908db2c89904c793b053b3e464b3a1c..f268aa4572730bbb0c2e1649e484f1f36175cac9 100644
--- a/Source/core/css/CSSComputedStyleDeclaration.cpp
+++ b/Source/core/css/CSSComputedStyleDeclaration.cpp
@@ -1617,7 +1617,7 @@ PassRefPtr<RenderStyle> CSSComputedStyleDeclaration::computeRenderStyle(CSSPrope
     ASSERT(styledNode);
     RenderObject* renderer = styledNode->renderer();
     if (renderer && renderer->isComposited() && !RuntimeEnabledFeatures::webAnimationsCSSEnabled() && AnimationController::supportsAcceleratedAnimationOfProperty(propertyID)) {
-        AnimationUpdateBlock animationUpdateBlock(renderer->animation());
+        AnimationUpdateBlock animationUpdateBlock(renderer->animation().get());
         if (m_pseudoElementSpecifier && !styledNode->isPseudoElement()) {
             // FIXME: This cached pseudo style will only exist if the animation has been run at least once.
             return renderer->animation()->getAnimatedStyleForRenderer(renderer)->getCachedPseudoStyle(m_pseudoElementSpecifier);