remove redundant CompletionRequestImpl class

pkg/analysis_server/lib/src/services/completion/completion_core.dart

Index: pkg/analysis_server/lib/src/services/completion/completion_core.dart
diff --git a/pkg/analysis_server/lib/src/services/completion/completion_core.dart b/pkg/analysis_server/lib/src/services/completion/completion_core.dart
index 8ee31adbc8abf77a567a1d5f87488b9ea11b8241..707c76a886ee806d15a0201c73d9573a437304b3 100644
--- a/pkg/analysis_server/lib/src/services/completion/completion_core.dart
+++ b/pkg/analysis_server/lib/src/services/completion/completion_core.dart
@@ -22,20 +22,19 @@ class CompletionRequestImpl implements CompletionRequest {
   final AnalysisContext context;
 
   @override
-  final ResourceProvider resourceProvider;
-
-  @override
   final Source source;
 
   @override
   final int offset;
 
-  @override
-  ServerPlugin get serverPlugin => server.serverPlugin;
-
   /**
    * Initialize a newly created completion request based on the given arguments.
    */
-  CompletionRequestImpl(this.server, this.context, this.resourceProvider,
-      this.source, this.offset);
+  CompletionRequestImpl(this.server, this.context, this.source, this.offset);
+
+  @override
+  ResourceProvider get resourceProvider => server.resourceProvider;
+
+  @override
+  ServerPlugin get serverPlugin => server.serverPlugin;
 }