Allow to have different files for different ISAs in NaCl manifest.

ppapi/native_client/tests/ppapi_browser/bad/ppapi_bad.html

Index: ppapi/native_client/tests/ppapi_browser/bad/ppapi_bad.html
===================================================================
--- ppapi/native_client/tests/ppapi_browser/bad/ppapi_bad.html	(revision 193870)
+++ ppapi/native_client/tests/ppapi_browser/bad/ppapi_bad.html	(working copy)
@@ -108,7 +108,7 @@
       tester,
       'bad_manifest_bad_files',
       'ppapi_bad_manifest_bad_files.nmf',
-      'NaCl module load failed: manifest: no version of file.txt given for current arch and no portable version found.');
+      'NaCl module load failed: manifest: file.txt property \'unknown_arch\' does not have required key: \'pnacl-translate\'.');

[Mark Seaborn, 2013/04/19 05:36:43]

Please add a comment here explaining the test expectation:  "The code looks for
2 keys: 'url' and 'pnacl-translate'. If neither is found it complains about the
last one" -- as you said.

[halyavin, 2013/04/19 06:41:51]

Done.

 
   // 'bad_manifest_nexe_arch' loads a manifest with no program entry for the
   // user's architecture