Replace and remove JavaException(s).

pkg/analyzer/lib/src/generated/source_io.dart

Index: pkg/analyzer/lib/src/generated/source_io.dart
diff --git a/pkg/analyzer/lib/src/generated/source_io.dart b/pkg/analyzer/lib/src/generated/source_io.dart
index dbdef6f1c9a421be281c53706ae4241945e1894b..f6af841a4bbf9b3ce95eb843e84996a2440fe4d5 100644
--- a/pkg/analyzer/lib/src/generated/source_io.dart
+++ b/pkg/analyzer/lib/src/generated/source_io.dart
@@ -376,7 +376,7 @@ class PackageUriResolver extends UriResolver {
    */
   PackageUriResolver(this._packagesDirectories) {
     if (_packagesDirectories.length < 1) {
-      throw new IllegalArgumentException(
+      throw new ArgumentError(
           "At least one package directory must be provided");
     }
   }
@@ -407,7 +407,7 @@ class PackageUriResolver extends UriResolver {
     JavaFile pkgDir = new JavaFile.relative(packagesDirectory, pkgName);
     try {
       pkgDir = pkgDir.getCanonicalFile();
-    } on JavaIOException catch (exception, stackTrace) {
+    } catch (exception, stackTrace) {
       if (!exception.toString().contains("Required key not available")) {
         AnalysisEngine.instance.logger.logError("Canonical failed: $pkgDir",
             new CaughtException(exception, stackTrace));