Remove runtime 'dart_app' as it became identical to 'vm'.

tests/lib/lib.status

Index: tests/lib/lib.status
diff --git a/tests/lib/lib.status b/tests/lib/lib.status
index 2a84f7b812b67ef1e1bec7751897e92735158c88..2e7457fb913a564390fd8f7fb5a69115e765b8e3 100644
--- a/tests/lib/lib.status
+++ b/tests/lib/lib.status
@@ -209,14 +209,11 @@ async/timer_not_available_test: Fail, OK # only meant to test when there is no w
 
 # 'js' tests import the dart:js library, so they only make sense in
 # a browser environment.
-[ ($runtime == vm || $runtime == dart_precompiled || $runtime == dart_app) ]
+[ $runtime == vm || $runtime == dart_precompiled ]
 js/*: Skip
 
-# 'js' tests import the dart:js library, so they only make sense in
-# a browser environment.
-[ $runtime == dart_app ]
-js/*: SkipByDesign
-mirrors/*: SkipByDesign
+[ $compiler == app_jit ]
+mirrors/*: Skip # Issue 27929: Triage
 
 [ $compiler == dart2js && $minified ]
 mirrors/mirrors_used_get_name_test: RuntimeError
@@ -255,13 +252,13 @@ async/timer_test: Fail, Pass
 [ $runtime == vm ]
 convert/streamed_conversion_json_utf8_decode_test: Pass, Slow # Infrequent timeouts.
 
-[ ($runtime == vm || $runtime == dart_precompiled || $runtime == dart_app) ]
+[ $runtime == vm || $runtime == dart_precompiled ]
 async/timer_not_available_test: Fail, OK
 mirrors/native_class_test: Fail, OK # This test is meant to run in a browser.
 mirrors/deferred_type_test: CompileTimeError, OK # Don't have a multitest marker for dynamic compile time errors.
 mirrors/initializing_formals_test/01: Fail # initializing formals are implicitly final as of Dart 1.21
 
-[ $compiler == none || $compiler == precompiler || $compiler == dart2app || $compiler == dart2appjit ]
+[ $compiler == none || $compiler == precompiler || $compiler == app_jit ]
 async/timer_not_available_test: SkipByDesign # only meant to test when there is no way to implement timer (currently only in d8)
 
 mirrors/symbol_validation_test: RuntimeError # Issue 13596
@@ -331,7 +328,7 @@ mirrors/*deferred*: Pass,RuntimeError # Issue 17458
 [ $compiler == dart2js && $mode == debug ]
 mirrors/native_class_test: Pass, Slow
 
-[ ($compiler == none || $compiler == precompiler || $compiler == dart2app || $compiler == dart2appjit) && $arch == mips ]
+[ ($compiler == none || $compiler == precompiler || $compiler == app_jit) && $arch == mips ]
 async/timer_regress22626_test: Pass, RuntimeError # Issue 22626
 
 [ $arch == simarm || $arch == simarmv6 || $arch == simarmv5te ]
@@ -354,13 +351,13 @@ convert/utf85_test: Skip # Pass, Slow Issue 20111.
 [ $mode == debug && $arch == ia32 && $system == windows ]
 convert/streamed_conversion_json_utf8_decode_test: Skip  # Verification OOM.
 
-[ ($runtime == vm || $runtime == dart_precompiled || $runtime == dart_app) && $mode == debug && $arch == x64 && $system == windows ]
+[ ($runtime == vm || $runtime == dart_precompiled) && $mode == debug && $arch == x64 && $system == windows ]
 convert/streamed_conversion_json_utf8_decode_test: Pass, Slow
 
 [ $mode == debug && $arch != ia32 && $arch != x64 && $arch != simarm && $arch != simarmv6 && $arch != simarmv5te ]
 convert/streamed_conversion_json_utf8_decode_test: Skip  # Verification not yet implemented.
 
-[ ($runtime == vm || $runtime == dart_precompiled || $runtime == dart_app) && $mode == debug && $builder_tag == asan ]
+[ ($runtime == vm || $runtime == dart_precompiled) && $mode == debug && $builder_tag == asan ]
 mirrors/immutable_collections_test: SkipSlow  # Timeout.
 convert/streamed_conversion_json_utf8_decode_test: Skip  # Timeout.