Fix all strong mode warnings in protoc-plugin

lib/src/plugin.pb.dart

Index: lib/src/plugin.pb.dart
diff --git a/lib/src/plugin.pb.dart b/lib/src/plugin.pb.dart
index 9ac0ae40d884a17af2a0e71295289131a55177c7..b0044ac9444396a666dbe2cdbbb1810a9eefdef2 100644
--- a/lib/src/plugin.pb.dart
+++ b/lib/src/plugin.pb.dart
@@ -29,14 +29,14 @@ class CodeGeneratorRequest extends GeneratedMessage {
     if (v is !CodeGeneratorRequest) checkItemFailed(v, 'CodeGeneratorRequest');
   }
 
-  List<String> get fileToGenerate => getField(1);
+  List<String> get fileToGenerate => $_get(0, 1, null) as List<String>;

[vsm, 2016/03/23 17:20:24]

here as well

 
-  String get parameter => getField(2);
-  void set parameter(String v) { setField(2, v); }
-  bool hasParameter() => hasField(2);
+  String get parameter => $_get(1, 2, '') as String;
+  void set parameter(String v) { $_setString(1, 2, v); }
+  bool hasParameter() => $_has(1, 2);
   void clearParameter() => clearField(2);
 
-  List<proto2.FileDescriptorProto> get protoFile => getField(15);
+  List<proto2.FileDescriptorProto> get protoFile => $_get(2, 15, null) as List<proto2.FileDescriptorProto>;
 }
 
 class _ReadonlyCodeGeneratorRequest extends CodeGeneratorRequest with ReadonlyMessageMixin {}
@@ -65,19 +65,19 @@ class CodeGeneratorResponse_File extends GeneratedMessage {
     if (v is !CodeGeneratorResponse_File) checkItemFailed(v, 'CodeGeneratorResponse_File');
   }
 
-  String get name => getField(1);
-  void set name(String v) { setField(1, v); }
-  bool hasName() => hasField(1);
+  String get name => $_get(0, 1, '') as String;
+  void set name(String v) { $_setString(0, 1, v); }
+  bool hasName() => $_has(0, 1);
   void clearName() => clearField(1);
 
-  String get insertionPoint => getField(2);
-  void set insertionPoint(String v) { setField(2, v); }
-  bool hasInsertionPoint() => hasField(2);
+  String get insertionPoint => $_get(1, 2, '') as String;
+  void set insertionPoint(String v) { $_setString(1, 2, v); }
+  bool hasInsertionPoint() => $_has(1, 2);
   void clearInsertionPoint() => clearField(2);
 
-  String get content => getField(15);
-  void set content(String v) { setField(15, v); }
-  bool hasContent() => hasField(15);
+  String get content => $_get(2, 15, '') as String;
+  void set content(String v) { $_setString(2, 15, v); }
+  bool hasContent() => $_has(2, 15);
   void clearContent() => clearField(15);
 }
 
@@ -106,12 +106,12 @@ class CodeGeneratorResponse extends GeneratedMessage {
     if (v is !CodeGeneratorResponse) checkItemFailed(v, 'CodeGeneratorResponse');
   }
 
-  String get error => getField(1);
-  void set error(String v) { setField(1, v); }
-  bool hasError() => hasField(1);
+  String get error => $_get(0, 1, '') as String;
+  void set error(String v) { $_setString(0, 1, v); }
+  bool hasError() => $_has(0, 1);
   void clearError() => clearField(1);
 
-  List<CodeGeneratorResponse_File> get file => getField(15);
+  List<CodeGeneratorResponse_File> get file => $_get(1, 15, null) as List<CodeGeneratorResponse_File>;
 }
 
 class _ReadonlyCodeGeneratorResponse extends CodeGeneratorResponse with ReadonlyMessageMixin {}