Revert of Remove migrateNetworkPredictionPreferences().

Revert of Remove migrateNetworkPredictionPreferences(). (patchset #3 id:40001 of https://codereview.chromium.org/1323993002/ )

Reason for revert:
Causing lots of crashes with ClassCastException.

Original issue's description:
> Remove migrateNetworkPredictionPreferences().
> 
> Remove predictive network action preference migration code on Android after one
> year.  This includes migrateNetworkPredictionPreferences(), string constants for
> preferences, and JNI accessors.
> 
> BUG=526773
> 
> Committed: https://crrev.com/2eab6589a52b9773f6c0294b69beef35ed4c7bf0
> Cr-Commit-Position: refs/heads/master@{#346898}


BUG=526773

[Bence, 2015-12-07 21:46:30]

Created Revert of Remove migrateNetworkPredictionPreferences().

[Bence, 2015-12-07 21:46:56]

Description was changed from

==========
Revert of Remove migrateNetworkPredictionPreferences(). (patchset #3 id:40001 of
https://codereview.chromium.org/1323993002/ )

Reason for revert:
Causing lots of crashes with ClassCastException.

Original issue's description:
> Remove migrateNetworkPredictionPreferences().
> 
> Remove predictive network action preference migration code on Android after
one
> year.  This includes migrateNetworkPredictionPreferences(), string constants
for
> preferences, and JNI accessors.
> 
> BUG=526773
> 
> Committed: https://crrev.com/2eab6589a52b9773f6c0294b69beef35ed4c7bf0
> Cr-Commit-Position: refs/heads/master@{#346898}

TBR=newt@chromium.org,yfriedman@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=526773
==========

to

==========
Revert of Remove migrateNetworkPredictionPreferences(). (patchset #3 id:40001 of
https://codereview.chromium.org/1323993002/ )

Reason for revert:
Causing lots of crashes with ClassCastException.

Original issue's description:
> Remove migrateNetworkPredictionPreferences().
> 
> Remove predictive network action preference migration code on Android after
one
> year.  This includes migrateNetworkPredictionPreferences(), string constants
for
> preferences, and JNI accessors.
> 
> BUG=526773
> 
> Committed: https://crrev.com/2eab6589a52b9773f6c0294b69beef35ed4c7bf0
> Cr-Commit-Position: refs/heads/master@{#346898}


BUG=526773
==========

[Bence, 2015-12-07 21:46:56]

bnc@chromium.org changed reviewers:
- newt@chromium.org

[Bence, 2015-12-07 21:54:54]

Closing this patch because we do not expect a clean revert to work.  JNI does
not take jobject anymore, they take JavaParamRef, among other reasons.