Fix behavior of GetOriginalNameFromHashedName

gpu/command_buffer/service/shader_manager.h

Index: gpu/command_buffer/service/shader_manager.h
diff --git a/gpu/command_buffer/service/shader_manager.h b/gpu/command_buffer/service/shader_manager.h
index 29d50660a24235090a92d19b8e73d0ebccd03a95..0b79ea4cb6eff6ea103a283a754b9ac929635dd4 100644
--- a/gpu/command_buffer/service/shader_manager.h
+++ b/gpu/command_buffer/service/shader_manager.h
@@ -124,9 +124,6 @@ class GPU_EXPORT Shader : public base::RefCounted<Shader> {
   const std::string* GetOriginalNameFromHashedName(
       const std::string& hashed_name) const;
 
-  const std::string* GetMappedName(
-      const std::string& original_name) const;
-
   const std::string& log_info() const {
     return log_info_;
   }