Fix more null-checks in SVGLengthContext::convertValueFrom*

Fix more null-checks in SVGLengthContext::convertValueFrom*

The following methods in SVGLengthContext:

 convertValueFromUserUnitsToCHS
 convertValueFromUserUnitsToEXS
 convertValueFromEXSToUserUnits

needs the same treatment as convertValueFromCHSToUserUnits got in
https://chromiumcodereview.appspot.com/2445463002.

R=pdr@chromium.org,eae@chromium.org
BUG=657438, 658585, 658613
Committed: https://crrev.com/4c55d78bcbaff133a4e688eddc7573e0609cf190
Cr-Commit-Position: refs/heads/master@{#427080}

[fs, 2016-10-24 11:49:11]

The CQ bit was checked by fs@opera.com to run a CQ dry run

[commit-bot: I haz the power, 2016-10-24 11:49:28]

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, 2016-10-24 13:52:20]

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

[commit-bot: I haz the power, 2016-10-24 13:52:21]

Dry run: This issue passed the CQ dry run.

[fs, 2016-10-24 15:32:11]

Description was changed from

==========
Fix more null-checks in SVGLengthContext::convertValueFrom*

The following methods in SVGLengthContext:

 convertValueFromUserUnitsToCHS
 convertValueFromUserUnitsToEXS
 convertValueFromEXSToUserUnits

needs the same treatment as convertValueFromCHSToUserUnits got in
https://chromiumcodereview.appspot.com/2445463002.

R=pdr@chromium.org,eae@chromium.org
BUG=657438,658585
==========

to

==========
Fix more null-checks in SVGLengthContext::convertValueFrom*

The following methods in SVGLengthContext:

 convertValueFromUserUnitsToCHS
 convertValueFromUserUnitsToEXS
 convertValueFromEXSToUserUnits

needs the same treatment as convertValueFromCHSToUserUnits got in
https://chromiumcodereview.appspot.com/2445463002.

R=pdr@chromium.org,eae@chromium.org
BUG=657438,658585,658613
==========

[eae, 2016-10-24 16:03:36]

LGTM, thank you

[eae, 2016-10-24 16:03:40]

The CQ bit was checked by eae@chromium.org

[commit-bot: I haz the power, 2016-10-24 16:04:03]

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, 2016-10-24 16:18:51]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-10-24 16:49:53]

Description was changed from

==========
Fix more null-checks in SVGLengthContext::convertValueFrom*

The following methods in SVGLengthContext:

 convertValueFromUserUnitsToCHS
 convertValueFromUserUnitsToEXS
 convertValueFromEXSToUserUnits

needs the same treatment as convertValueFromCHSToUserUnits got in
https://chromiumcodereview.appspot.com/2445463002.

R=pdr@chromium.org,eae@chromium.org
BUG=657438,658585,658613
==========

to

==========
Fix more null-checks in SVGLengthContext::convertValueFrom*

The following methods in SVGLengthContext:

 convertValueFromUserUnitsToCHS
 convertValueFromUserUnitsToEXS
 convertValueFromEXSToUserUnits

needs the same treatment as convertValueFromCHSToUserUnits got in
https://chromiumcodereview.appspot.com/2445463002.

R=pdr@chromium.org,eae@chromium.org
BUG=657438,658585,658613

Committed: https://crrev.com/4c55d78bcbaff133a4e688eddc7573e0609cf190
Cr-Commit-Position: refs/heads/master@{#427080}
==========

[commit-bot: I haz the power, 2016-10-24 16:49:54]

Patchset 1 (id:??) landed as
https://crrev.com/4c55d78bcbaff133a4e688eddc7573e0609cf190
Cr-Commit-Position: refs/heads/master@{#427080}