Fix a bug with an unused variable.

Fix a bug with an unused variable.

Fix my previous: Forgot to insert code that actually uses the
variable.

Strangely, clang did not report this, but other compilers did.

tbr=vegorov@

BUG=

Committed: https://github.com/dart-lang/sdk/commit/0e9d63d034038833413cd32988019258cfa3a0b7

[Florian Schneider, 2016-11-01 16:25:51]

fschneider@google.com changed reviewers:
+ vegorov@google.com

[Florian Schneider, 2016-11-01 16:25:51]

TBR

[Florian Schneider, 2016-11-01 16:26:07]

Description was changed from

==========
Fix a bug with an unused variable.

Fix my previous: Forgot to insert code that actually uses the
variable.

Strangely, clang did not report this, but other compilers did.

BUG=
==========

to

==========
Fix a bug with an unused variable.

Fix my previous: Forgot to insert code that actually uses the
variable.

Strangely, clang did not report this, but other compilers did.

tbr=vegorov@

BUG=
==========

[Florian Schneider, 2016-11-01 16:28:19]

Description was changed from

==========
Fix a bug with an unused variable.

Fix my previous: Forgot to insert code that actually uses the
variable.

Strangely, clang did not report this, but other compilers did.

tbr=vegorov@

BUG=
==========

to

==========
Fix a bug with an unused variable.

Fix my previous: Forgot to insert code that actually uses the
variable.

Strangely, clang did not report this, but other compilers did.

tbr=vegorov@

BUG=

Committed:
https://github.com/dart-lang/sdk/commit/0e9d63d034038833413cd32988019258cfa3a0b7
==========

[Florian Schneider, 2016-11-01 16:28:20]

Committed patchset #1 (id:1) manually as
0e9d63d034038833413cd32988019258cfa3a0b7 (presubmit successful).

[Vyacheslav Egorov (Google), 2016-11-01 16:32:28]

lgtm