Do PPB_FileIO Query and Read in the plugin process.

ppapi/tests/test_file_ref.cc

Index: ppapi/tests/test_file_ref.cc
diff --git a/ppapi/tests/test_file_ref.cc b/ppapi/tests/test_file_ref.cc
index 04e8ce1ff67a72a85c44f4279d22b5eedb0dcb34..d1448ec7edd4b5eaefc912b7de41661f8ebb09b5 100644
--- a/ppapi/tests/test_file_ref.cc
+++ b/ppapi/tests/test_file_ref.cc
@@ -365,10 +365,10 @@ std::string TestFileRef::TestQueryAndTouchFile() {
   ASSERT_EQ(4, callback.result());
 
   // Touch.
-  // last_access_time's granularity is 1 day
-  // last_modified_time's granularity is 2 seconds
   const PP_Time last_access_time = 123 * 24 * 3600.0;
-  const PP_Time last_modified_time = 246.0;
+  // last_modified_time's granularity is 2 seconds
+  // See note in test_file_io.cc for why we use this time.
+  const PP_Time last_modified_time = 100 * 24 * 3600.0;
   callback.WaitForResult(file_ref.Touch(last_access_time, last_modified_time,
                                         callback.GetCallback()));
   CHECK_CALLBACK_BEHAVIOR(callback);