make sure profile is forwarded through build web command (#39414)

diff --git a/packages/flutter_tools/lib/src/web/compile.dart b/packages/flutter_tools/lib/src/web/compile.dart
index d241998..94bd2ac 100644
--- a/packages/flutter_tools/lib/src/web/compile.dart
+++ b/packages/flutter_tools/lib/src/web/compile.dart
@@ -30,7 +30,7 @@
   try {
     result = await webCompilationProxy.initialize(
       projectDirectory: FlutterProject.current().directory,
-      release: buildInfo.isRelease,
+      mode: buildInfo.mode,
     );
     if (result) {
       // Places assets adjacent to the web stuff.
@@ -81,7 +81,7 @@
   Future<bool> initialize({
     @required Directory projectDirectory,
     String testOutputDir,
-    bool release,
+    BuildMode mode,
   }) async {
     throw UnimplementedError();
   }