Fix missing retun value.

preparser/preparser-process.cc

Index: preparser/preparser-process.cc
diff --git a/preparser/preparser-process.cc b/preparser/preparser-process.cc
index 66b53a1b376b0674218d19af22667319de0b8cfc..0cd7a6382f391f0cf548502c230a0a5a60a2f6af 100644
--- a/preparser/preparser-process.cc
+++ b/preparser/preparser-process.cc
@@ -183,9 +183,10 @@ class ScopedPointer {
   ~ScopedPointer() { if (pointer_ != NULL) delete[] pointer_; }
   T& operator[](int index) { return pointer_[index]; }
   T* operator*() { return pointer_ ;}
-  T*& operator=(T* new_value) {
+  T* operator=(T* new_value) {
     if (pointer_ != NULL) delete[] pointer_;
     pointer_ = new_value;
+    return new_value;
   }
  private:
   T* pointer_;