Hook up the --minify option in dart2js and use it to get rid of unnecessary whitespace inside funct…

lib/compiler/implementation/compiler.dart

Index: lib/compiler/implementation/compiler.dart
diff --git a/lib/compiler/implementation/compiler.dart b/lib/compiler/implementation/compiler.dart
index ec4a5cb689c822771329656a1cda72d3550233f3..23797006b1f4a05d250d98e8961a7876c762c991 100644
--- a/lib/compiler/implementation/compiler.dart
+++ b/lib/compiler/implementation/compiler.dart
@@ -70,6 +70,8 @@ class Compiler implements DiagnosticListener {
   String assembledCode;
   Namer namer;
   Types types;
+
+  final bool enableMinification;
   final bool enableTypeAssertions;
   final bool enableUserAssertions;
 
@@ -166,9 +168,9 @@ class Compiler implements DiagnosticListener {
   Compiler([this.tracer = const Tracer(),
             this.enableTypeAssertions = false,
             this.enableUserAssertions = false,
+            this.enableMinification = false,
             bool emitJavascript = true,
             bool generateSourceMap = true,
-            bool minify = false,
             bool cutDeclarationTypes = false])
       : libraries = new Map<String, LibraryElement>(),
         world = new World(),
@@ -186,7 +188,7 @@ class Compiler implements DiagnosticListener {
     typesTask = new ti.TypesTask(this);
     backend = emitJavascript ?
         new js_backend.JavaScriptBackend(this, generateSourceMap) :
-        new dart_backend.DartBackend(this, minify, cutDeclarationTypes);
+        new dart_backend.DartBackend(this, cutDeclarationTypes);
     enqueuer = new EnqueueTask(this);
     tasks = [scanner, dietParser, parser, resolver, closureToClassMapper,
              checker, typesTask, constantHandler, enqueuer];