Change ACCELERATED_COMPOSITING blacklist to GPU_COMPOSITING.

extensions/common/manifest_handlers/requirements_info.cc

Index: extensions/common/manifest_handlers/requirements_info.cc
diff --git a/extensions/common/manifest_handlers/requirements_info.cc b/extensions/common/manifest_handlers/requirements_info.cc
index bc26170d91a05f329d092d8e54a6cf082da28483..9a2a22b92aaf39ddfb247ecbd48aa2754b749178 100644
--- a/extensions/common/manifest_handlers/requirements_info.cc
+++ b/extensions/common/manifest_handlers/requirements_info.cc
@@ -18,7 +18,6 @@ namespace errors = manifest_errors;
 
 RequirementsInfo::RequirementsInfo(const Manifest* manifest)
     : webgl(false),
-      css3d(false),
       npapi(false),
       window_shape(false) {
   // Before parsing requirements from the manifest, automatically default the
@@ -121,7 +120,8 @@ bool RequirementsHandler::Parse(Extension* extension, base::string16* error) {
           if (feature == "webgl") {
             requirements->webgl = true;
           } else if (feature == "css3d") {
-            requirements->css3d = true;
+            // css3d is always available, so no check is needed, but no error is
+            // generated.
           } else {
             *error = ErrorUtils::FormatErrorMessageUTF16(
                 errors::kInvalidRequirement, iter.key());