Use only MemoryByteStore in analyzer_cli.

pkg/analyzer_cli/lib/src/driver.dart

Index: pkg/analyzer_cli/lib/src/driver.dart
diff --git a/pkg/analyzer_cli/lib/src/driver.dart b/pkg/analyzer_cli/lib/src/driver.dart
index f3c57a2ae99c0a6f00728150a8dd329cfffa696c..e6e3ad7197df7846220bbfdb77f1013a3f0f4b0c 100644
--- a/pkg/analyzer_cli/lib/src/driver.dart
+++ b/pkg/analyzer_cli/lib/src/driver.dart
@@ -21,7 +21,6 @@ import 'package:analyzer/source/sdk_ext.dart';
 import 'package:analyzer/src/context/builder.dart';
 import 'package:analyzer/src/dart/analysis/byte_store.dart';
 import 'package:analyzer/src/dart/analysis/driver.dart';
-import 'package:analyzer/src/dart/analysis/file_byte_store.dart';
 import 'package:analyzer/src/dart/analysis/file_state.dart';
 import 'package:analyzer/src/dart/sdk/sdk.dart';
 import 'package:analyzer/src/generated/constant.dart';
@@ -78,7 +77,6 @@ class Driver implements CommandLineStarter {
       new PerformanceTag("Driver._analyzeAll");
 
   static ByteStore analysisDriverMemoryByteStore = new MemoryByteStore();
-  static ByteStore analysisDriverFileByteStore = _createFileByteStore();
 
   /// The plugins that are defined outside the `analyzer_cli` package.
   List<Plugin> _userDefinedPlugins = <Plugin>[];
@@ -581,9 +579,7 @@ class Driver implements CommandLineStarter {
           scheduler,
           log,
           resourceProvider,
-          options.useAnalysisDriverMemoryByteStore
-              ? analysisDriverMemoryByteStore
-              : analysisDriverFileByteStore,
+          analysisDriverMemoryByteStore,
           new FileContentOverlay(),
           'test',
           context.sourceFactory,
@@ -788,22 +784,6 @@ class Driver implements CommandLineStarter {
     context.analysisOptions = analysisOptions;
   }
 
-  /**
-   * If the state location can be accessed, return the file byte store,
-   * otherwise return the memory byte store.
-   */
-  static ByteStore _createFileByteStore() {
-    const int M = 1024 * 1024 /*1 MiB*/;
-    const int G = 1024 * 1024 * 1024 /*1 GiB*/;
-    file_system.Folder stateLocation =
-        PhysicalResourceProvider.INSTANCE.getStateLocation('.analysis-driver');
-    if (stateLocation == null) {
-      return new MemoryByteStore();
-    }
-    return new MemoryCachingByteStore(
-        new EvictingFileByteStore(stateLocation.path, G), 64 * M);
-  }
-
   /// Perform a deep comparison of two string lists.
   static bool _equalLists(List<String> l1, List<String> l2) {
     if (l1.length != l2.length) {