remove old completion API

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

Index: pkg/analysis_server/lib/src/provisional/completion/completion_core.dart
diff --git a/pkg/analysis_server/lib/src/provisional/completion/completion_core.dart b/pkg/analysis_server/lib/src/provisional/completion/completion_core.dart
index bdebfcc0c61c84d83f95e707b01b148bc744d56f..9a585dd35a39cbc8c1d9817ea5964c443d5bbc40 100644
--- a/pkg/analysis_server/lib/src/provisional/completion/completion_core.dart
+++ b/pkg/analysis_server/lib/src/provisional/completion/completion_core.dart
@@ -71,34 +71,3 @@ abstract class CompletionRequest {
    */
   Source get source;
 }
-
-/**
- * The result of computing suggestions for code completion.
- *
- * Clients may implement this class when implementing plugins.
- */
-abstract class CompletionResult {
-  /**
-   * Return the length of the text to be replaced. This will be zero (0) if the
-   * suggestion is to be inserted, otherwise it will be greater than zero. For
-   * example, if the remainder of the identifier containing the cursor is to be
-   * replaced when the suggestion is applied, in which case the length will be
-   * the number of characters in the existing identifier.
-   */
-  int get replacementLength;
-
-  /**
-   * Return the offset of the start of the text to be replaced. This will be
-   * different than the offset used to request the completion suggestions if
-   * there was a portion of text that needs to be replaced. For example, if a
-   * partial identifier is immediately before the original offset, in which case
-   * the replacementOffset will be the offset of the beginning of the
-   * identifier.
-   */
-  int get replacementOffset;
-
-  /**
-   * Return the list of suggestions being contributed by the contributor.
-   */
-  List<CompletionSuggestion> get suggestions;
-}