[analyzer] Refactoring: Drop the 'GR' prefix.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@122424 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/GR/SymbolManager.cpp b/lib/GR/SymbolManager.cpp
index 95df307..6d078f4 100644
--- a/lib/GR/SymbolManager.cpp
+++ b/lib/GR/SymbolManager.cpp
@@ -8,7 +8,7 @@
 //===----------------------------------------------------------------------===//
 //
 //  This file defines SymbolManager, a class that manages symbolic values
-//  created for use by GRExprEngine and related classes.
+//  created for use by ExprEngine and related classes.
 //
 //===----------------------------------------------------------------------===//