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

tests/corelib/corelib.status

Index: tests/corelib/corelib.status
diff --git a/tests/corelib/corelib.status b/tests/corelib/corelib.status
index 48cfb52164142bed76c6e2754f11dea8bd07acbf..846fd39188103d5c47d6d963676f60945f5f1be1 100644
--- a/tests/corelib/corelib.status
+++ b/tests/corelib/corelib.status
@@ -14,7 +14,7 @@ string_from_environment2_test: Skip
 string_from_environment3_test: Skip
 string_from_environment_test: Skip
 
-[ ($compiler == none || $compiler == precompiler || $compiler == dart2app || $compiler == dart2appjit) ]
+[ $compiler == none || $compiler == precompiler || $compiler == app_jit ]
 unicode_test: Fail        # Bug 6706
 compare_to2_test: Fail    # Bug 4018
 
@@ -30,7 +30,7 @@ symbol_operator_test/03: Fail # bug 11669
 string_case_test/01: Fail # Bug 18061
 
 # #void should be a valid symbol.
-[ $compiler == none || $compiler == precompiler || $compiler == dart2app || $compiler == dart2appjit || $compiler == dart2js ]
+[ $compiler == none || $compiler == precompiler || $compiler == app_jit || $compiler == dart2js ]
 symbol_reserved_word_test/02: CompileTimeError # bug 20191
 symbol_reserved_word_test/05: CompileTimeError # bug 20191
 
@@ -61,7 +61,7 @@ int_modulo_arith_test/modPow: RuntimeError # No bigints.
 [ $compiler == dart2js && $fast_startup ]
 apply3_test: Fail # mirrors not supported
 
-[ ($compiler == none || $compiler == precompiler || $compiler == dart2app || $compiler == dart2appjit) && $runtime != dartium && $runtime != drt ]
+[ ($compiler == none || $compiler == precompiler || $compiler == app_jit) && $runtime != dartium && $runtime != drt ]
 symbol_test/02: MissingCompileTimeError # bug 11669
 symbol_test/03: MissingCompileTimeError # bug 11669
 
@@ -156,10 +156,10 @@ stopwatch_test: Skip  # Flaky test due to expected performance behaviour.
 # The regexp tests are not verified to work on non d8/vm platforms yet.
 regexp/*: Skip
 
-[ ($runtime == vm || $runtime == dart_precompiled || $runtime == dart_app) ]
+[ $runtime == vm || $runtime == dart_precompiled ]
 regexp/global_test: Skip # Timeout. Issue 21709 and 21708
 
-[ $runtime != vm && $runtime != dart_precompiled && $runtime != dart_app && $compiler != dart2analyzer]
+[ $runtime != vm && $runtime != dart_precompiled && $compiler != dart2analyzer]
 data_resource_test: RuntimeError # Issue 23825 (not implemented yet).
 file_resource_test: Skip, OK # VM specific test, uses dart:io.
 http_resource_test: Skip, OK # VM specific test, uses dart:io.
@@ -170,7 +170,7 @@ package_resource_test: RuntimeError # Issue 26842
 [ $mode == debug ]
 regexp/pcre_test: Pass, Slow # Timeout. Issue 22008
 
-[ ($runtime == vm || $runtime == dart_precompiled || $runtime == dart_app) && $arch == simarmv5te ]
+[ ($runtime == vm || $runtime == dart_precompiled) && $arch == simarmv5te ]
 int_parse_radix_test/*: Pass, Slow
 big_integer_parsed_mul_div_vm_test: Pass, Slow
 
@@ -199,7 +199,7 @@ big_integer_huge_mul_vm_test: Pass, Timeout # --no_intrinsify
 big_integer_parsed_mul_div_vm_test: Pass, Timeout # --no_intrinsify
 int_parse_radix_test: Pass, Timeout # --no_intrinsify
 
-[ $compiler == precompiler || $runtime == dart_app ]
+[ $compiler == precompiler || $compiler == app_jit ]
 data_resource_test: Skip # Resolve URI not supported yet in product mode.
 package_resource_test: Skip # Resolve URI not supported yet in product mode.
 file_resource_test: Skip # Resolve URI not supported yet in product mode.