renaming File to Source

test/span_test.dart

Index: test/span_test.dart
diff --git a/test/span_test.dart b/test/span_test.dart
index e816bc88513b6b9f349f92bbcee87ac4e3087cb3..8f61b5871f99aa313f531b99dbbcb60ec425939d 100644
--- a/test/span_test.dart
+++ b/test/span_test.dart
@@ -25,7 +25,7 @@ const String TEST_FILE = '''
 List<int> newLines = TEST_FILE.split('\n').map((s) => s.length).toList();
 
 main() {
-  var file = new File.text('file', TEST_FILE);
+  var file = new SourceFile.text('file', TEST_FILE);
   span(int start, int end) => file.span(start, end);
   loc(int offset) => file.location(offset);
 
@@ -80,7 +80,7 @@ main() {
 
   test('get location message - no file url', () {
     var line = 10 + 80 + 31 + 27 + 4;
-    expect(new File.text(null, TEST_FILE).getLocationMessage(
+    expect(new SourceFile.text(null, TEST_FILE).getLocationMessage(
         'the message', line + 2, line + 11),
         ':5:3: the message\n'
         '1234+6789_1234\n'
@@ -166,7 +166,8 @@ main() {
   });
 
   test('file segment', () {
-    var segment = new FileSegment('file', TEST_FILE.substring(12), loc(12));
+    var segment = new SourceFileSegment('file',
+        TEST_FILE.substring(12), loc(12));
     sline(int n) => segment.getLine(n);
     scol(int n) => segment.getColumn(segment.getLine(n), n);
 
@@ -207,6 +208,7 @@ class TestSpan extends Span {
 }
 
 class TestLocation extends Location {
+  String get sourceUrl => '';
   TestLocation(int offset) : super(offset);
   get line => 0;
   get column => 0;