Remove non-impl-side painting as an option for blink.

cc/blink/web_layer_impl.cc

Index: cc/blink/web_layer_impl.cc
diff --git a/cc/blink/web_layer_impl.cc b/cc/blink/web_layer_impl.cc
index f0fd873690434ebee2d7192c8dacc1d4ae39b4b4..3ba9431171d333c280da57f1159fb2272d6dfaf9 100644
--- a/cc/blink/web_layer_impl.cc
+++ b/cc/blink/web_layer_impl.cc
@@ -46,8 +46,6 @@ using blink::WebFilterOperations;
 namespace cc_blink {
 namespace {
 
-bool g_impl_side_painting_enabled = false;
-
 base::LazyInstance<cc::LayerSettings> g_layer_settings =
     LAZY_INSTANCE_INITIALIZER;
 
@@ -71,16 +69,6 @@ WebLayerImpl::~WebLayerImpl() {
 }
 
 // static
-bool WebLayerImpl::UsingPictureLayer() {
-  return g_impl_side_painting_enabled;
-}
-
-// static
-void WebLayerImpl::SetImplSidePaintingEnabled(bool enabled) {
-  g_impl_side_painting_enabled = enabled;
-}
-
-// static
 void WebLayerImpl::SetLayerSettings(const cc::LayerSettings& settings) {
   g_layer_settings.Get() = settings;
 }