Move MediaGalleries.getMediaFileSystems back to experimental for M22

Move MediaGalleries.getMediaFileSystems back to experimental for M22

BUG=110823
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=150164

[Evan Stade, 2012-08-06 22:29:34]

lgtm

[vandebo (ex-Chrome), 2012-08-06 22:31:29]

+asargent for extension review
+thestig for chrome/renderer/renderer_resources.grd

[Lei Zhang, 2012-08-06 22:44:34]

.grd change LGTM

[asargent_no_longer_on_chrome, 2012-08-06 23:04:20]

LGTM

[commit-bot: I haz the power, 2012-08-06 23:05:48]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/vandebo@chromium.org/10823193/1

[commit-bot: I haz the power, 2012-08-06 23:05:55]

Presubmit check for 10823193-1 failed and returned exit status 1.

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** Presubmit Warnings **
This change modifies the extension docs but the generated docs have not been
updated properly. See chrome/common/extensions/docs/README.txt for more info.
 - Changes to
chrome/common/extensions/docs/static/experimental.mediaGalleries.html not
reflected in generated doc.
First build DumpRenderTree, then update the docs by running:
  chrome/common/extensions/docs/build/build.py --page-name=<apiName>

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