Improve platform support indications for policy documentation.

Improve platform support indications for policy documentation.

The generated policy documentation indicates example values and preferences
paths. This change only shows the data relevant for the platforms where the
policy is actually supported.

BUG=None

[Joao da Silva, 2013-11-27 11:11:11]

Just a cosmetic cleanup, PTAL. Thanks!

[pastarmovj, 2013-11-27 12:22:36]

LGTM but I don't have Python readability so I don't know if it's enough to have
my blessing here. Also have you checked if lambdas are ok with the code style?

[Joao da Silva, 2013-11-27 12:26:03]

Lambdas are fine:
http://google-styleguide.googlecode.com/svn/trunk/pyguide.html#Lambda_Functions

I'll ping Jói about readability, but I don't think it's needed.

[Jói, 2013-11-27 12:44:44]

LGTM with a tiny nit.

https://codereview.chromium.org/91273002/diff/1/grit/format/policy_templates/...
File grit/format/policy_templates/writers/doc_writer.py (right):

https://codereview.chromium.org/91273002/diff/1/grit/format/policy_templates/...
grit/format/policy_templates/writers/doc_writer.py:648: 'string': ' (REG_SZ)',
I'd rather see these without a space and without the surrounding parenthesis, as
they can be added when you format the string for Windows on line 464.

[Joao da Silva, 2013-11-27 13:03:22]

https://codereview.chromium.org/91273002/diff/1/grit/format/policy_templates/...
File grit/format/policy_templates/writers/doc_writer.py (right):

https://codereview.chromium.org/91273002/diff/1/grit/format/policy_templates/...
grit/format/policy_templates/writers/doc_writer.py:648: 'string': ' (REG_SZ)',
On 2013/11/27 12:44:44, Jói wrote:
> I'd rather see these without a space and without the surrounding parenthesis,
as
> they can be added when you format the string for Windows on line 464.

Done; note that this CL has been closed and uploaded again as
https://codereview.chromium.org/91233003/