Remove use of Compiler in inferrer engines.

pkg/compiler/lib/src/tracer.dart

Index: pkg/compiler/lib/src/tracer.dart
diff --git a/pkg/compiler/lib/src/tracer.dart b/pkg/compiler/lib/src/tracer.dart
index ad0b47adc1b613533560e2d76d16eed563178209..cdebb1cc61aaadd487444e6e623df33b00e7abc4 100644
--- a/pkg/compiler/lib/src/tracer.dart
+++ b/pkg/compiler/lib/src/tracer.dart
@@ -5,7 +5,6 @@
 library tracer;
 
 import '../compiler_new.dart' as api;
-import 'compiler.dart' show Compiler;
 import 'js_backend/namer.dart' show Namer;
 import 'ssa/nodes.dart' as ssa show HGraph;
 import 'ssa/ssa_tracer.dart' show HTracer;
@@ -34,12 +33,13 @@ class Tracer extends TracerUtil {
   final api.OutputSink output;
   final RegExp traceFilter;
 
-  Tracer(this.closedWorld, this.namer, Compiler compiler)
+  Tracer(this.closedWorld, this.namer, api.CompilerOutput compilerOutput)
       : traceFilter = TRACE_FILTER_PATTERN == null
             ? null
             : new RegExp(TRACE_FILTER_PATTERN),
         output = TRACE_FILTER_PATTERN != null
-            ? compiler.outputProvider('dart', 'cfg', api.OutputType.debug)
+            ? compilerOutput.createOutputSink(
+                'dart', 'cfg', api.OutputType.debug)
             : null;
 
   bool get isEnabled => traceFilter != null;