Revert "Implemented support for generalized void in analyzer."

pkg/analyzer/lib/src/error/codes.dart

Index: pkg/analyzer/lib/src/error/codes.dart
diff --git a/pkg/analyzer/lib/src/error/codes.dart b/pkg/analyzer/lib/src/error/codes.dart
index d687703c61bc802168f2ba61dc82862b3361589b..baad8320645b41792e96db373f91258c656e98fd 100644
--- a/pkg/analyzer/lib/src/error/codes.dart
+++ b/pkg/analyzer/lib/src/error/codes.dart
@@ -4723,6 +4723,16 @@ class StaticWarningCode extends ErrorCode {
           "Try correcting the name to an existing setter, or "
           "defining the setter in a superclass of '{1}'.");
 
+  /**
+   * 7.2 Getters: It is a static warning if the return type of a getter is void.
+   */
+  static const StaticWarningCode VOID_RETURN_FOR_GETTER =
+      const StaticWarningCode(
+          'VOID_RETURN_FOR_GETTER',
+          "The return type of a getter can't be 'void'.",
+          "Try providing a return type for the getter.",
+          false);
+
   /**
    * A flag indicating whether this warning is an error when running with strong
    * mode enabled.