Revert of Revert of Enable display list 2D canvas by default

content/child/runtime_features.cc

Index: content/child/runtime_features.cc
diff --git a/content/child/runtime_features.cc b/content/child/runtime_features.cc
index 2e723340de20f6eceff2916b558004860b572493..c70a850ca8ed284eef8f76e00a6a65556513382d 100644
--- a/content/child/runtime_features.cc
+++ b/content/child/runtime_features.cc
@@ -145,17 +145,14 @@
   if (command_line.HasSwitch(switches::kEnableAcceleratedJpegDecoding))
     WebRuntimeFeatures::enableDecodeToYUV(true);
 
-  if (command_line.HasSwitch(switches::kDisableDisplayList2dCanvas)) {
+  if (command_line.HasSwitch(switches::kEnableDisplayList2dCanvas))
+    WebRuntimeFeatures::enableDisplayList2dCanvas(true);
+
+  if (command_line.HasSwitch(switches::kDisableDisplayList2dCanvas))
     WebRuntimeFeatures::enableDisplayList2dCanvas(false);
-  } else if (command_line.HasSwitch(switches::kForceDisplayList2dCanvas)) {
+
+  if (command_line.HasSwitch(switches::kForceDisplayList2dCanvas))
     WebRuntimeFeatures::forceDisplayList2dCanvas(true);
-  } else if (command_line.HasSwitch(switches::kEnableDisplayList2dCanvas)) {
-    WebRuntimeFeatures::enableDisplayList2dCanvas(true);
-  } else {
-    WebRuntimeFeatures::enableDisplayList2dCanvas(
-        base::FieldTrialList::FindFullName("DisplayList2dCanvas") == "Enabled"
-    );
-  }
 
   if (command_line.HasSwitch(switches::kEnableWebGLDraftExtensions))
     WebRuntimeFeatures::enableWebGLDraftExtensions(true);