Deprecate all diagnostics methods that use strings.

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

Index: pkg/front_end/lib/src/fasta/fasta.dart
diff --git a/pkg/front_end/lib/src/fasta/fasta.dart b/pkg/front_end/lib/src/fasta/fasta.dart
index 865192b2aa6fed78a8eaa327703b6683a72d2e65..984c1fbc4cbfd4318f203e2fa014ad9a7164d9fe 100644
--- a/pkg/front_end/lib/src/fasta/fasta.dart
+++ b/pkg/front_end/lib/src/fasta/fasta.dart
@@ -24,7 +24,12 @@ import 'compiler_command_line.dart' show CompilerCommandLine;
 
 import 'compiler_context.dart' show CompilerContext;
 
-import 'errors.dart' show InputError, formatUnexpected, inputError, reportCrash;
+import 'deprecated_problems.dart'
+    show
+        deprecated_InputError,
+        deprecated_formatUnexpected,
+        deprecated_inputError,
+        reportCrash;
 
 import 'kernel/kernel_target.dart' show KernelTarget;
 
@@ -82,9 +87,9 @@ Future<KernelTarget> outline(List<String> arguments) async {
           new CompileTask(c, new Ticker(isVerbose: c.options.verbose));
       return await task.buildOutline(c.options.output);
     });
-  } on InputError catch (e) {
+  } on deprecated_InputError catch (e) {
     exitCode = 1;
-    print(e.format());
+    print(e.deprecated_format());
     return null;
   }
 }
@@ -100,9 +105,9 @@ Future<Uri> compile(List<String> arguments) async {
           new CompileTask(c, new Ticker(isVerbose: c.options.verbose));
       return await task.compile();
     });
-  } on InputError catch (e) {
+  } on deprecated_InputError catch (e) {
     exitCode = 1;
-    print(e.format());
+    print(e.deprecated_format());
     return null;
   }
 }
@@ -143,7 +148,7 @@ class CompileTask {
     if (path.endsWith(".dart")) {
       kernelTarget.read(uri);
     } else {
-      inputError(uri, -1, "Unexpected input: $uri");
+      deprecated_inputError(uri, -1, "Unexpected input: $uri");
     }
     await dillTarget.buildOutlines();
     var outline = await kernelTarget.buildOutlines();
@@ -185,11 +190,11 @@ Future<CompilationResult> parseScriptInFileSystem(Uri fileName,
   try {
     if (!await fileSystem.entityForUri(fileName).exists()) {
       return new CompilationResult.error(
-          formatUnexpected(fileName, -1, "No such file."));
+          deprecated_formatUnexpected(fileName, -1, "No such file."));
     }
     if (!await new Directory.fromUri(patchedSdk).exists()) {
-      return new CompilationResult.error(
-          formatUnexpected(patchedSdk, -1, "Patched sdk directory not found."));
+      return new CompilationResult.error(deprecated_formatUnexpected(
+          patchedSdk, -1, "Patched sdk directory not found."));
     }
 
     Program program;
@@ -209,8 +214,8 @@ Future<CompilationResult> parseScriptInFileSystem(Uri fileName,
       if (kernelTarget.errors.isNotEmpty) {
         return new CompilationResult.errors(kernelTarget.errors);
       }
-    } on InputError catch (e) {
-      return new CompilationResult.error(e.format());
+    } on deprecated_InputError catch (e) {
+      return new CompilationResult.error(e.deprecated_format());
     }
 
     if (program.mainMethod == null) {