Deprecate all diagnostics methods that use strings.

pkg/front_end/lib/src/fasta/kernel/kernel_shadow_ast.dart

Index: pkg/front_end/lib/src/fasta/kernel/kernel_shadow_ast.dart
diff --git a/pkg/front_end/lib/src/fasta/kernel/kernel_shadow_ast.dart b/pkg/front_end/lib/src/fasta/kernel/kernel_shadow_ast.dart
index 40eca1aa818cf2a444dfae9ad3eeb0441d5990d9..41da6ee7667caf461c971672851608d446ce5b2d 100644
--- a/pkg/front_end/lib/src/fasta/kernel/kernel_shadow_ast.dart
+++ b/pkg/front_end/lib/src/fasta/kernel/kernel_shadow_ast.dart
@@ -30,7 +30,7 @@ import 'package:kernel/ast.dart'
 import 'package:kernel/frontend/accessors.dart';
 import 'package:kernel/type_environment.dart';
 
-import '../errors.dart' show internalError;
+import '../deprecated_problems.dart' show deprecated_internalProblem;
 
 /// Computes the return type of a (possibly factory) constructor.
 InterfaceType computeConstructorReturnType(Member constructor) {
@@ -537,7 +537,7 @@ class KernelDirectMethodInvocation extends DirectMethodInvocation
     // DirectMethodInvocation can only occur as a result of a use of `super`,
     // and `super` can't appear inside a field initializer.  So this code should
     // never be reached.
-    internalError(
+    deprecated_internalProblem(
         'Unexpected call to _collectDependencies for DirectMethodInvocation');
   }
 
@@ -563,7 +563,7 @@ class KernelDirectPropertyGet extends DirectPropertyGet
     // DirectPropertyGet can only occur as a result of a use of `super`, and
     // `super` can't appear inside a field initializer.  So this code should
     // never be reached.
-    internalError(
+    deprecated_internalProblem(
         'Unexpected call to _collectDependencies for DirectPropertyGet');
   }
 
@@ -1451,7 +1451,7 @@ class KernelProcedure extends Procedure implements KernelMember {
           new InstrumentationValueForType(inferredType));
       function.returnType = inferredType;
     } else {
-      internalError(
+      deprecated_internalProblem(
           'setInferredType called on a procedure that is not an accessor');
     }
   }
@@ -2413,22 +2413,22 @@ class KernelYieldStatement extends YieldStatement implements KernelStatement {
 
 class _UnfinishedCascade extends Expression {
   accept(v) {
-    return internalError("Internal error: Unsupported operation.");
+    return deprecated_internalProblem("Internal error: Unsupported operation.");
   }
 
   accept1(v, arg) {
-    return internalError("Internal error: Unsupported operation.");
+    return deprecated_internalProblem("Internal error: Unsupported operation.");
   }
 
   getStaticType(types) {
-    return internalError("Internal error: Unsupported operation.");
+    return deprecated_internalProblem("Internal error: Unsupported operation.");
   }
 
   transformChildren(v) {
-    return internalError("Internal error: Unsupported operation.");
+    return deprecated_internalProblem("Internal error: Unsupported operation.");
   }
 
   visitChildren(v) {
-    return internalError("Internal error: Unsupported operation.");
+    return deprecated_internalProblem("Internal error: Unsupported operation.");
   }
 }