tools/gn: depend on allocator_extension.cc to keep bootstrap working

tools/gn: depend on allocator_extension.cc to keep bootstrap working

This patch adds the missing base/allocator/allocator_extension.cc to
the sources list to keep the boostrap process working and to fix the
undefined reference error as below:

malloc_dump_provider.cc:(.text+0x92): undefined reference to
`base::allocator::GetNumericProperty(char const*, unsigned long*)'

BUG=None
TEST=./tools/gn/bootstrap/bootstrap.py
TBR=brettw@chromium.org

Committed: https://crrev.com/22d5facb2fef65c3085477319a96eeadf3650d3f
Cr-Commit-Position: refs/heads/master@{#364053}

[tfarina, 2015-12-09 13:12:54]

TBRing...

[tfarina, 2015-12-09 13:13:12]

The CQ bit was checked by tfarina@chromium.org

[commit-bot: I haz the power, 2015-12-09 13:13:50]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1511203002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1511203002/1

[commit-bot: I haz the power, 2015-12-09 13:24:18]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-12-09 13:25:23]

Description was changed from

==========
tools/gn: depend on allocator_extension.cc to keep bootstrap working

This patch adds the missing base/allocator/allocator_extension.cc to
the sources list to keep the boostrap process working and to fix the
undefined reference error as below:

malloc_dump_provider.cc:(.text+0x92): undefined reference to
`base::allocator::GetNumericProperty(char const*, unsigned long*)'

BUG=None
TEST=./tools/gn/bootstrap/bootstrap.py
TBR=brettw@chromium.org
==========

to

==========
tools/gn: depend on allocator_extension.cc to keep bootstrap working

This patch adds the missing base/allocator/allocator_extension.cc to
the sources list to keep the boostrap process working and to fix the
undefined reference error as below:

malloc_dump_provider.cc:(.text+0x92): undefined reference to
`base::allocator::GetNumericProperty(char const*, unsigned long*)'

BUG=None
TEST=./tools/gn/bootstrap/bootstrap.py
TBR=brettw@chromium.org

Committed: https://crrev.com/22d5facb2fef65c3085477319a96eeadf3650d3f
Cr-Commit-Position: refs/heads/master@{#364053}
==========

[commit-bot: I haz the power, 2015-12-09 13:25:24]

Patchset 1 (id:??) landed as
https://crrev.com/22d5facb2fef65c3085477319a96eeadf3650d3f
Cr-Commit-Position: refs/heads/master@{#364053}

[Dirk Pranke, 2015-12-09 16:47:47]

dpranke@chromium.org changed reviewers:
+ dpranke@chromium.org

[Dirk Pranke, 2015-12-09 16:47:47]

lgtm