Simplify language feature management.

test/mjsunit/debug-script.js

 // Copyright 2008 the V8 project authors. All rights reserved.
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 // modification, are permitted provided that the following conditions are
 // met:
 //
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 //       with the distribution.
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 //       from this software without specific prior written permission.
 //
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 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 // Flags: --expose-debug-as debug --expose-gc --send-idle-notification
+// Flags: --allow-natives-syntax
 
 // Get the Debug object exposed from the debug context global object.
 Debug = debug.Debug;
 
 Date();
 RegExp();
 
 // Count script types.
 var named_native_count = 0;
 var named_native_names = {};
@@ skipping 13 matching lines @@
   } else if (scripts[i].type == Debug.ScriptType.Extension) {
     extension_count++;
   } else if (scripts[i].type == Debug.ScriptType.Normal) {
     normal_count++;
   } else {
     assertUnreachable('Unexpected type ' + scripts[i].type);
   }
 }
 
 // This has to be updated if the number of native scripts change.
-assertTrue(named_native_count == 26 || named_native_count == 27);
+assertEquals(%NativeScriptsCount(), named_native_count);
 // Only the 'gc' extension is loaded.
 assertEquals(1, extension_count);
 // This script and mjsunit.js has been loaded.  If using d8, d8 loads
 // a normal script during startup too.
 assertTrue(normal_count == 2 || normal_count == 3);
 
 // Test a builtins script.
 var math_script = Debug.findScript('native math.js');
 assertEquals('native math.js', math_script.name);
 assertEquals(Debug.ScriptType.Native, math_script.type);
@@ skipping 16 matching lines @@
 }
 
 // Test a normal script.
 var mjsunit_js_script = Debug.findScript(/mjsunit.js/);
 assertTrue(/mjsunit.js/.test(mjsunit_js_script.name));
 assertEquals(Debug.ScriptType.Normal, mjsunit_js_script.type);
 
 // Check a nonexistent script.
 var dummy_script = Debug.findScript('dummy.js');
 assertTrue(typeof dummy_script == 'undefined');