Disable access to secondary dex files.

Disable access to secondary dex files.

This CL contains a check to make sure that secondary dex files aren't
accessed by isolated processes (in debug only). This should catch
new occurences of classes that need to be in the main dex file not
ending up in the main dex list.

BUG=657024

[estevenson, 2016-11-14 21:22:25]

The CQ bit was checked by estevenson@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-11-14 21:23:37]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-11-14 22:57:31]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-11-14 22:57:31]

Dry run: Try jobs failed on following builders:
  android_clang_dbg_recipe on master.tryserver.chromium.android (JOB_FAILED,
https://build.chromium.org/p/tryserver.chromium.android/builders/android_clan...)

[estevenson, 2016-11-14 23:10:52]

The CQ bit was checked by estevenson@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-11-14 23:12:37]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-11-15 00:49:38]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-11-15 00:49:39]

Dry run: This issue passed the CQ dry run.