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

gpu/command_buffer/service/shader_manager.cc

Index: gpu/command_buffer/service/shader_manager.cc
diff --git a/gpu/command_buffer/service/shader_manager.cc b/gpu/command_buffer/service/shader_manager.cc
index b3ea27ed19faf0210f228bf86c439b52d4d98728..590b3a25077fd1aa5d1d0f04bb08ee4da4c8ee32 100644
--- a/gpu/command_buffer/service/shader_manager.cc
+++ b/gpu/command_buffer/service/shader_manager.cc
@@ -117,7 +117,7 @@ Shader* ShaderManager::CreateShader(
 
 Shader* ShaderManager::GetShader(GLuint client_id) {
   ShaderMap::iterator it = shaders_.find(client_id);
-  return it != shaders_.end() ? it->second : NULL;
+  return it != shaders_.end() ? it->second.get() : NULL;
 }
 
 bool ShaderManager::GetClientId(GLuint service_id, GLuint* client_id) const {