Move Compiler.libraries to LibraryLoader.

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

Index: sdk/lib/_internal/compiler/implementation/mirrors_used.dart
diff --git a/sdk/lib/_internal/compiler/implementation/mirrors_used.dart b/sdk/lib/_internal/compiler/implementation/mirrors_used.dart
index 5285027c9335163caf7fec09806702d61210cdee..27d505cb42e966ca2059da76debe2514f2e1fd9e 100644
--- a/sdk/lib/_internal/compiler/implementation/mirrors_used.dart
+++ b/sdk/lib/_internal/compiler/implementation/mirrors_used.dart
@@ -175,7 +175,7 @@ class MirrorUsageAnalyzer {
   /// compute which libraries have the annotation (which is used by
   /// [MirrorUsageAnalyzerTask.hasMirrorUsage]).
   void run() {
-    wildcard = compiler.libraries.values.toList();
+    wildcard = compiler.libraryLoader.libraries.toList();
     Map<LibraryElement, List<MirrorUsage>> usageMap =
         collectMirrorsUsedAnnotation();
     propagateOverrides(usageMap);
@@ -195,7 +195,7 @@ class MirrorUsageAnalyzer {
   Map<LibraryElement, List<MirrorUsage>> collectMirrorsUsedAnnotation() {
     Map<LibraryElement, List<MirrorUsage>> result =
         new Map<LibraryElement, List<MirrorUsage>>();
-    for (LibraryElement library in compiler.libraries.values) {
+    for (LibraryElement library in compiler.libraryLoader.libraries) {
       if (library.isInternalLibrary) continue;
       for (LibraryTag tag in library.tags) {
         Import importTag = tag.asImport();
@@ -471,7 +471,7 @@ class MirrorUsageBuilder {
         String string = entry;
         LibraryElement libraryCandiate;
         String libraryNameCandiate;
-        for (LibraryElement l in compiler.libraries.values) {
+        for (LibraryElement l in compiler.libraryLoader.libraries) {
           if (l.hasLibraryName()) {
             String libraryName = l.getLibraryOrScriptName();
             if (string == libraryName) {