Remove Compiler.assembledCode.

pkg/compiler/lib/src/js_emitter/old_emitter/emitter.dart

Index: pkg/compiler/lib/src/js_emitter/old_emitter/emitter.dart
diff --git a/pkg/compiler/lib/src/js_emitter/old_emitter/emitter.dart b/pkg/compiler/lib/src/js_emitter/old_emitter/emitter.dart
index 40a747308c37b9f4be70cc4cc5ec6662b73d3d74..51a94d6d2982c14c033da47fe41329980810b2a8 100644
--- a/pkg/compiler/lib/src/js_emitter/old_emitter/emitter.dart
+++ b/pkg/compiler/lib/src/js_emitter/old_emitter/emitter.dart
@@ -1825,7 +1825,6 @@ class OldEmitter implements Emitter {
     compiler.outputProvider('', 'js')
         ..add(assembledCode)
         ..close();
-    compiler.assembledCode = assembledCode;
   }
 
   /// Used by incremental compilation to patch up the prototype of
@@ -2004,7 +2003,7 @@ function(originalDescriptor, name, holder, isStatic, globalFunctionsAccess) {
     return nativeBuffer;
   }
 
-  void emitProgram(Program program) {
+  int emitProgram(Program program) {
     // Shorten the code by using [namer.currentIsolate] as temporary.
     isolateProperties = namer.currentIsolate;
 
@@ -2023,6 +2022,9 @@ function(originalDescriptor, name, holder, isStatic, globalFunctionsAccess) {
         !backend.htmlLibraryIsLoaded) {
       compiler.reportHint(NO_LOCATION_SPANNABLE, MessageKind.PREAMBLE);
     }
+
+    // Return the total program size.
+    return outputBuffers.values.fold(0, (a, b) => a + b.length);
   }
 
   String generateSourceMapTag(Uri sourceMapUri, Uri fileUri) {