cc: Remove if checks for PictureLayerImpl::tilings_.

cc/layers/picture_layer_impl.cc

Index: cc/layers/picture_layer_impl.cc
diff --git a/cc/layers/picture_layer_impl.cc b/cc/layers/picture_layer_impl.cc
index 3dbce3cb6dab0bb1327dfb34bb0811fbccc7b8b6..9f5c14c80aaa744928ea3cad1590451dadf54d4d 100644
--- a/cc/layers/picture_layer_impl.cc
+++ b/cc/layers/picture_layer_impl.cc
@@ -589,9 +589,8 @@ void PictureLayerImpl::DidBeginTracing() {
 
 void PictureLayerImpl::ReleaseResources() {
   // Recreate tilings with new settings, since some of those might change when
-  // we release resources. If tilings_ is null, then leave it as null.
-  if (tilings_)
-    tilings_ = CreatePictureLayerTilingSet();
+  // we release resources.
+  tilings_ = CreatePictureLayerTilingSet();
   ResetRasterScale();
 
   // To avoid an edge case after lost context where the tree is up to date but
@@ -784,8 +783,7 @@ PictureLayerTiling* PictureLayerImpl::AddTiling(float contents_scale) {
 }
 
 void PictureLayerImpl::RemoveAllTilings() {
-  if (tilings_)
-    tilings_->RemoveAllTilings();
+  tilings_->RemoveAllTilings();
   // If there are no tilings, then raster scales are no longer meaningful.
   ResetRasterScale();
 }