Code style fix.

gpu/command_buffer/service/context_group.h

Index: gpu/command_buffer/service/context_group.h
diff --git a/gpu/command_buffer/service/context_group.h b/gpu/command_buffer/service/context_group.h
index 5226aa10d6979643a41d48c5c737b263b52f5f96..b2daa4c6417f4b178ac7275840573d007baf6c58 100644
--- a/gpu/command_buffer/service/context_group.h
+++ b/gpu/command_buffer/service/context_group.h
@@ -45,10 +45,10 @@ struct DisallowedFeatures;
 class GPU_EXPORT ContextGroup : public base::RefCounted<ContextGroup> {
  public:
   enum ContextType {
-    kContextTypeWebGL1,
-    kContextTypeWebGL2,
-    kContextTypeOther,
-    kContextTypeUndefined
+    CONTEXT_TYPE_WEBGL1,
+    CONTEXT_TYPE_WEBGL2,
+    CONTEXT_TYPE_OTHER,
+    CONTEXT_TYPE_UNDEFINED
   };
 
   static ContextType GetContextType(unsigned webgl_version);