Remove useless const keywords

@@ -29,7 +29,7 @@ pdf/roboto.ttf:
 format: format-dart format-clang
 
 format-dart: $(DART_SRC)
-	dartfmt -w $^
+	dartfmt -w --fix $^
 
 format-clang: $(CLNG_SRC)
 	clang-format -style=Chromium -i $^

@@ -74,7 +74,7 @@ class PdfDocument {
   final DeflateCallback deflate;
 
   /// These map the page modes just defined to the pagemodes setting of Pdf.
-  static const _PdfPageModes = const [
+  static const _PdfPageModes = [
     "/UseNone",
     "/UseOutlines",
     "/UseThumbs",

@@ -19,11 +19,11 @@
 part of pdf;
 
 class PdfPageFormat {
-  static const a4 = const PdfPageFormat(595.28, 841.89);
-  static const a3 = const PdfPageFormat(841.89, 1190.55);
-  static const a5 = const PdfPageFormat(420.94, 595.28);
-  static const letter = const PdfPageFormat(612.0, 792.0);
-  static const legal = const PdfPageFormat(612.0, 1008.0);
+  static const a4 = PdfPageFormat(595.28, 841.89);
+  static const a3 = PdfPageFormat(841.89, 1190.55);
+  static const a5 = PdfPageFormat(420.94, 595.28);
+  static const letter = PdfPageFormat(612.0, 792.0);
+  static const legal = PdfPageFormat(612.0, 1008.0);
 
   static const point = 1.0;
   static const inch = 72.0;

@@ -25,7 +25,7 @@ import 'package:flutter/widgets.dart';
 import 'package:pdf/pdf.dart';
 
 class Printing {
-  static const MethodChannel _channel = const MethodChannel('printing');
+  static const MethodChannel _channel = MethodChannel('printing');
 
   static Future<Null> printPdf({PdfDocument document, List<int> bytes}) async {
     assert(document != null || bytes != null);