Update Linux to use scoped_refptr<T>::get() rather than implicit "operator T*"

gpu/command_buffer/service/program_manager.cc

Index: gpu/command_buffer/service/program_manager.cc
diff --git a/gpu/command_buffer/service/program_manager.cc b/gpu/command_buffer/service/program_manager.cc
index 55cb39d0a53282c7f1c0b68da24f79472d9332fe..64d647a108af24c0a2e60b72bc83c4b193693037 100644
--- a/gpu/command_buffer/service/program_manager.cc
+++ b/gpu/command_buffer/service/program_manager.cc
@@ -1150,7 +1150,7 @@ Program* ProgramManager::CreateProgram(
 
 Program* ProgramManager::GetProgram(GLuint client_id) {
   ProgramMap::iterator it = programs_.find(client_id);
-  return it != programs_.end() ? it->second : NULL;
+  return it != programs_.end() ? it->second.get() : NULL;
 }
 
 bool ProgramManager::GetClientId(GLuint service_id, GLuint* client_id) const {