Remove support for remaining deprecated features.

sdk/lib/_internal/compiler/implementation/dart2js.dart

Index: sdk/lib/_internal/compiler/implementation/dart2js.dart
diff --git a/sdk/lib/_internal/compiler/implementation/dart2js.dart b/sdk/lib/_internal/compiler/implementation/dart2js.dart
index 55812c0c6d932efd846d82de38cd91cafe254e7c..54b242baf489777c0a8e3fa220242a7bd3ed32b2 100644
--- a/sdk/lib/_internal/compiler/implementation/dart2js.dart
+++ b/sdk/lib/_internal/compiler/implementation/dart2js.dart
@@ -256,9 +256,6 @@ void compile(List<String> argv) {
     new OptionHandler('--analyze-only', setAnalyzeOnly),
     new OptionHandler('--analyze-signatures-only', passThrough),
     new OptionHandler('--disable-native-live-type-analysis', passThrough),
-    new OptionHandler('--reject-deprecated-language-features', passThrough),
-    new OptionHandler('--report-sdk-use-of-deprecated-language-features',
-                      passThrough),
     new OptionHandler('--categories=.*', setCategories),
     new OptionHandler('--global-js-name=.*', checkGlobalName),
     new OptionHandler('--disable-type-inference', passThrough),
@@ -526,19 +523,6 @@ be removed in a future version:
     Disable the optimization that removes unused native types from dart:html
     and related libraries.
 
-  --reject-deprecated-language-features
-    Reject deprecated language features.  Without this option, the
-    compiler will accept language features that are no longer valid
-    according to The Dart Programming Language Specification, version
-    0.12, M1.
-
-  --report-sdk-use-of-deprecated-language-features
-    Report use of deprecated features in Dart platform libraries.
-    Without this option, the compiler will silently accept use of
-    deprecated language features from these libraries.  The option
-    --reject-deprecated-language-features controls if these usages are
-    reported as errors or warnings.
-
   --categories=<categories>
     A comma separated list of allowed library categories.  The default
     is "Client".  Possible categories can be seen by providing an