fix: remove reflection from file permission settings

File setReadable(), setWritable(), setExecutable() was added in API
level 9, so we should not need to protect android users from missing
methods as we support Android API 19+.

google-http-client-android/src/main/java/com/google/api/client/extensions/android/util/store/FileDataStoreFactory.java

@@ -121,39 +121,23 @@ public FileDataStoreFactory getDataStoreFactory() {
    * executed by the file's owner.
    *
    * @param file the file's permissions to modify
-   * @throws IOException
    */
-  static void setPermissionsToOwnerOnly(File file) throws IOException {
+  static void setPermissionsToOwnerOnly(File file) {
     // Disable access by other users if O/S allows it and set file permissions to readable and
-    // writable by user. Use reflection since JDK 1.5 will not have these methods
+    // writable by user.
     try {
-      Method setReadable = File.class.getMethod("setReadable", boolean.class, boolean.class);
-      Method setWritable = File.class.getMethod("setWritable", boolean.class, boolean.class);
-      Method setExecutable = File.class.getMethod("setExecutable", boolean.class, boolean.class);
-      if (!(Boolean) setReadable.invoke(file, false, false)
-          || !(Boolean) setWritable.invoke(file, false, false)
-          || !(Boolean) setExecutable.invoke(file, false, false)) {
+      if (!file.setReadable(false, false)
+          || !file.setWritable(false, false)
+          || !file.setExecutable(false, false)) {
         LOGGER.warning("unable to change permissions for everybody: " + file);
       }
-      if (!(Boolean) setReadable.invoke(file, true, true)
-          || !(Boolean) setWritable.invoke(file, true, true)
-          || !(Boolean) setExecutable.invoke(file, true, true)) {
+      if (!file.setReadable(true, true)
+          || !file.setWritable(true, true)
+          || !file.setExecutable(true, true)) {
         LOGGER.warning("unable to change permissions for owner: " + file);
       }
-    } catch (InvocationTargetException exception) {
-      Throwable cause = exception.getCause();
-      Throwables.propagateIfPossible(cause, IOException.class);
-      // shouldn't reach this point, but just in case...
-      throw new RuntimeException(cause);
-    } catch (NoSuchMethodException exception) {
-      LOGGER.warning(
-          "Unable to set permissions for "
-              + file
-              + ", likely because you are running a version of Java prior to 1.6");
     } catch (SecurityException exception) {
       // ignored
-    } catch (IllegalAccessException exception) {
-      // ignored
     } catch (IllegalArgumentException exception) {
       // ignored
     }