Remove unnessary includes of parser.h

src/background-parsing-task.cc

Index: src/background-parsing-task.cc
diff --git a/src/background-parsing-task.cc b/src/background-parsing-task.cc
index 5df46c82b9049c372b33673b013395274627795d..fc5cbb45a68197d4e40060afd22d5bf8469fa952 100644
--- a/src/background-parsing-task.cc
+++ b/src/background-parsing-task.cc
@@ -3,11 +3,19 @@
 // found in the LICENSE file.
 
 #include "src/background-parsing-task.h"
+
 #include "src/debug/debug.h"
+#include "src/parsing/parser.h"
 
 namespace v8 {
 namespace internal {
 
+void StreamedSource::Release() {
+  parser.reset();
+  info.reset();
+  zone.reset();
+}
+
 BackgroundParsingTask::BackgroundParsingTask(
     StreamedSource* source, ScriptCompiler::CompileOptions options,
     int stack_size, Isolate* isolate)