Add a missing cast to ValueDeserializer::ReadVarint.

Add a missing cast to ValueDeserializer::ReadVarint.

Without this cast, the integer type isn't promoted before being shifted, and so
for types larger than sizeof(int) there is data loss. This will become an issue
once the host begins using this helper to send 64-bit integers.

BUG=chromium:148757
Committed: https://crrev.com/4c0ca533e726de080ad12366e6c56fe8f90b656e
Cr-Commit-Position: refs/heads/master@{#39296}

[jbroman, 2016-09-08 18:02:37]

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

[commit-bot: I haz the power, 2016-09-08 18:02:41]

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

[jbroman, 2016-09-08 18:03:21]

jbroman@chromium.org changed reviewers:
+ cbruni@chromium.org, jkummerow@chromium.org

[jbroman, 2016-09-08 18:03:22]

Fixed this bug in Blink (https://codereview.chromium.org/2321713002), only to
realize I had made the same mistake here. There will be unit tests that catch
this when I expose this logic to the host.

[commit-bot: I haz the power, 2016-09-08 18:29:52]

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

[commit-bot: I haz the power, 2016-09-08 18:29:53]

Dry run: This issue passed the CQ dry run.

[Camillo Bruni, 2016-09-08 18:42:33]

lgtm

[jbroman, 2016-09-08 19:03:20]

The CQ bit was checked by jbroman@chromium.org

[commit-bot: I haz the power, 2016-09-08 19:03:26]

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, 2016-09-08 19:05:45]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-09-08 19:06:17]

Description was changed from

==========
Add a missing cast to ValueDeserializer::ReadVarint.

Without this cast, the integer type isn't promoted before being shifted, and so
for types larger than sizeof(int) there is data loss. This will become an issue
once the host begins using this helper to send 64-bit integers.

BUG=chromium:148757
==========

to

==========
Add a missing cast to ValueDeserializer::ReadVarint.

Without this cast, the integer type isn't promoted before being shifted, and so
for types larger than sizeof(int) there is data loss. This will become an issue
once the host begins using this helper to send 64-bit integers.

BUG=chromium:148757

Committed: https://crrev.com/4c0ca533e726de080ad12366e6c56fe8f90b656e
Cr-Commit-Position: refs/heads/master@{#39296}
==========

[commit-bot: I haz the power, 2016-09-08 19:06:18]

Patchset 1 (id:??) landed as
https://crrev.com/4c0ca533e726de080ad12366e6c56fe8f90b656e
Cr-Commit-Position: refs/heads/master@{#39296}