Use FileSystem to read files in SourceLoader and TranslateUri.

pkg/front_end/lib/src/fasta/fasta.dart

Index: pkg/front_end/lib/src/fasta/fasta.dart
diff --git a/pkg/front_end/lib/src/fasta/fasta.dart b/pkg/front_end/lib/src/fasta/fasta.dart
index c42058949ab626e87c808ef7f4f98e9397d63861..eb4867d749ca587417494de17966fb440e0cc79a 100644
--- a/pkg/front_end/lib/src/fasta/fasta.dart
+++ b/pkg/front_end/lib/src/fasta/fasta.dart
@@ -10,6 +10,7 @@ import 'dart:convert' show JSON;
 
 import 'dart:io' show BytesBuilder, Directory, File, exitCode;
 
+import 'package:front_end/physical_file_system.dart';
 import 'package:kernel/binary/ast_to_binary.dart'
     show LibraryFilteringBinaryPrinter;
 
@@ -117,12 +118,12 @@ class CompileTask {
   KernelTarget createKernelTarget(
       DillTarget dillTarget, TranslateUri uriTranslator, bool strongMode) {
     return new KernelTarget(
-        dillTarget, uriTranslator, strongMode, c.uriToSource);
+        c.fileSystem, dillTarget, uriTranslator, strongMode, c.uriToSource);
   }
 
   Future<KernelTarget> buildOutline([Uri output]) async {
-    TranslateUri uriTranslator =
-        await TranslateUri.parse(c.options.sdk, c.options.packages);
+    TranslateUri uriTranslator = await TranslateUri.parse(
+        c.fileSystem, c.options.sdk, c.options.packages);
     ticker.logMs("Read packages file");
     DillTarget dillTarget = createDillTarget(uriTranslator);
     KernelTarget kernelTarget =
@@ -175,12 +176,13 @@ Future<CompilationResult> parseScript(
 
     Program program;
     try {
-      TranslateUri uriTranslator = await TranslateUri.parse(null, packages);
+      TranslateUri uriTranslator =
+          await TranslateUri.parse(PhysicalFileSystem.instance, null, packages);
       final Ticker ticker = new Ticker(isVerbose: verbose);
       final DillTarget dillTarget = new DillTarget(ticker, uriTranslator);
       dillTarget.read(patchedSdk.resolve('platform.dill'));
-      final KernelTarget kernelTarget =
-          new KernelTarget(dillTarget, uriTranslator, strongMode);
+      final KernelTarget kernelTarget = new KernelTarget(
+          PhysicalFileSystem.instance, dillTarget, uriTranslator, strongMode);
       kernelTarget.read(fileName);
       await dillTarget.writeOutline(null);
       program = await kernelTarget.writeOutline(null);
@@ -245,13 +247,13 @@ Future writeDepsFile(Uri script, Uri depsFile, Uri output,
       c.options.options["--verbose"] = true;
     }
 
-    TranslateUri uriTranslator =
-        await TranslateUri.parse(c.options.sdk, c.options.packages);
+    TranslateUri uriTranslator = await TranslateUri.parse(
+        c.fileSystem, c.options.sdk, c.options.packages);
     ticker.logMs("Read packages file");
     DillTarget dillTarget = new DillTarget(ticker, uriTranslator)
       ..read(platform);
-    KernelTarget kernelTarget =
-        new KernelTarget(dillTarget, uriTranslator, false, c.uriToSource);
+    KernelTarget kernelTarget = new KernelTarget(PhysicalFileSystem.instance,
+        dillTarget, uriTranslator, false, c.uriToSource);
 
     kernelTarget.read(script);
     await dillTarget.writeOutline(null);