Dart SDK Spelling b, c, and d.

pkg/compiler/lib/src/js_emitter/full_emitter/emitter.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library dart2js.js_emitter.full_emitter;
 
 import 'dart:collection' show HashMap;
 import 'dart:convert';
 
 import 'package:js_runtime/shared/embedded_names.dart' as embeddedNames;
@@ skipping 1324 matching lines @@
     bool isProgramSplit = program.isSplit;
 
     List<jsAst.Statement> statements = <jsAst.Statement>[];
 
     statements..add(buildGeneratedBy())..add(js.comment(HOOKS_API_USAGE));
 
     if (isProgramSplit) {
       statements.add(buildDeferredHeader());
     }
 
-    // Collect the AST for the decriptors
+    // Collect the AST for the descriptors.
     Map<Element, ClassBuilder> descriptors = elementDescriptors[mainFragment];
     if (descriptors == null) descriptors = const {};
 
     checkEverythingEmitted(descriptors.keys);
 
     Iterable<LibraryEntity> libraries = outputLibraryLists[mainOutputUnit];
     if (libraries == null) libraries = <LibraryElement>[];
 
     List<jsAst.Expression> parts = <jsAst.Expression>[];
     for (LibraryEntity library in _sorter.sortLibraries(libraries)) {
@@ skipping 572 matching lines @@
     // data.
     mapping["_comment"] = "This mapping shows which compiled `.js` files are "
         "needed for a given deferred library import.";
     mapping.addAll(compiler.deferredLoadTask.computeDeferredMap());
     compiler.outputProvider(
         compiler.options.deferredMapUri.path, '', OutputType.info)
       ..add(const JsonEncoder.withIndent("  ").convert(mapping))
       ..close();
   }
 }