Allow updating the `targetUrl` property of SingleMapping.

Allow updating the `targetUrl` property of SingleMapping.

R=sigmund@google.com

Committed: https://code.google.com/p/dart/source/detail?r=38245

[tjblasi, 2014-07-15 17:53:14]

It seems like if we can update other pieces of the SingleMapping `targetUrl`
should be fair game too - what do you think?

Thanks!

[Siggi Cherem (dart-lang), 2014-07-15 17:54:56]

good point  :) lgtm

https://codereview.chromium.org/397693002/diff/1/pkg/source_maps/lib/parser.dart
File pkg/source_maps/lib/parser.dart (right):

https://codereview.chromium.org/397693002/diff/1/pkg/source_maps/lib/parser.d...
pkg/source_maps/lib/parser.dart:152: String sourceRoot = null;
just realized this - since this is not final, the `= null` is not necessary
here, feel free to remove it too.

[tjblasi, 2014-07-15 18:00:14]

Thanks!

https://codereview.chromium.org/397693002/diff/1/pkg/source_maps/lib/parser.dart
File pkg/source_maps/lib/parser.dart (right):

https://codereview.chromium.org/397693002/diff/1/pkg/source_maps/lib/parser.d...
pkg/source_maps/lib/parser.dart:152: String sourceRoot = null;
On 2014/07/15 17:54:56, Siggi Cherem (dart-lang) wrote:
> just realized this - since this is not final, the `= null` is not necessary
> here, feel free to remove it too.

Done.

[tjblasi, 2014-07-15 18:07:10]

Committed patchset #2 manually as r38245 (presubmit successful).