Revert "Implement parsing support for generic functions"

runtime/vm/parser.h

Index: runtime/vm/parser.h
diff --git a/runtime/vm/parser.h b/runtime/vm/parser.h
index 416d11ac8d7e51631e8e4ee0214e3efc94be749d..d2644b72f8794b9841bf816ad273e2d03bb108bd 100644
--- a/runtime/vm/parser.h
+++ b/runtime/vm/parser.h
@@ -285,7 +285,6 @@ class Parser : public ValueObject {
 
   struct Block;
   class TryStack;
-  class TokenPosScope;
 
   Parser(const Script& script,
          const Library& library,
@@ -753,14 +752,9 @@ class Parser : public ValueObject {
   bool IsMixinAppAlias();
   bool TryParseQualIdent();
   bool TryParseTypeParameters();
-  bool TryParseTypeArguments();
-  bool IsTypeParameters();
-  bool IsArgumentPart();
-  bool IsParameterPart();
   bool TryParseOptionalType();
   bool TryParseReturnType();
   bool IsVariableDeclaration();
-  bool IsFunctionReturnType();
   bool IsFunctionDeclaration();
   bool IsFunctionLiteral();
   bool IsForInStatement();