Revert "Rename internal library dart:_collection-dev to dart:_internal."

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

Index: sdk/lib/_internal/compiler/implementation/compiler.dart
diff --git a/sdk/lib/_internal/compiler/implementation/compiler.dart b/sdk/lib/_internal/compiler/implementation/compiler.dart
index a49913157ca8a30f9e108da2cbb0f20efea8377a..417ed7b356af112718d1b995bc4135954e1496b7 100644
--- a/sdk/lib/_internal/compiler/implementation/compiler.dart
+++ b/sdk/lib/_internal/compiler/implementation/compiler.dart
@@ -452,7 +452,7 @@ abstract class Compiler implements DiagnosticListener {
   // Initialized after mirrorSystemClass has been resolved.
   FunctionElement mirrorSystemGetNameFunction;
 
-  // Initialized when dart:_collection-dev is loaded.
+  // Initialized when dart:_internal is loaded.
   ClassElement symbolImplementationClass;
 
   // Initialized when symbolImplementationClass has been resolved.
@@ -809,7 +809,7 @@ abstract class Compiler implements DiagnosticListener {
       typedDataLibrary = library;
       typedDataClass =
           findRequiredElement(library, 'TypedData');
-    } else if (uri == new Uri(scheme: 'dart', path: '_collection-dev')) {
+    } else if (uri == new Uri(scheme: 'dart', path: '_internal')) {
       symbolImplementationClass =
           findRequiredElement(library, 'Symbol');
     } else if (uri == new Uri(scheme: 'dart', path: 'async')) {