analyzer: Disable the unnecessary_import check.

Change-Id: Ib50bd79c453c40b18598b6b6aaafe1a134d4f11a
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/200521
Reviewed-by: Zach Anderson <zra@google.com>
Commit-Queue: Samuel Rawlins <srawlins@google.com>

pkg/analyzer/lib/src/dart/analysis/library_analyzer.dart

@@ -299,8 +299,9 @@ class LibraryAnalyzer {
       verifier.generateDuplicateShownHiddenNameHints(errorReporter);
       verifier.generateUnusedImportHints(errorReporter);
       verifier.generateUnusedShownNameHints(errorReporter);
-      verifier.generateUnnecessaryImportHints(
-          errorReporter, _usedImportedElementsList);
+      // TODO(srawlins): Re-enable this check once Flutter engine path is clear.
+      // verifier.generateUnnecessaryImportHints(
+      //     errorReporter, _usedImportedElementsList);
     }
 
     // Unused local elements.

pkg/analyzer/test/src/diagnostics/unnecessary_import_test.dart

@@ -9,7 +9,8 @@ import '../dart/resolution/context_collection_resolution.dart';
 
 main() {
   defineReflectiveSuite(() {
-    defineReflectiveTests(UnnecessaryImportTest);
+    // TODO(srawlins): Re-enable this check once Flutter engine path is clear.
+    // defineReflectiveTests(UnnecessaryImportTest);
   });
 }