[fsp] Rename chrome://fsp-internals to chrome://provided-file-systems.

[fsp] Rename chrome://fsp-internals to chrome://provided-file-systems.

This patch renames the cryptic fsp name to easier to understand provided "file
systems" in the C++ code. Also, the url has changed accordingly.

TEST=Tested manually by invoking chrome://provided-file-systems with a running
providing extension.
BUG=376095
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=273145

[mtomasz, 2014-05-27 05:34:30]

@jochen: PTAL. This is a mechanical change, renaming the cryptic "fsp" to
"provided file systems".

@hashimoto: CC'd.

[jochen (gone - plz use gerrit), 2014-05-27 13:45:47]

rs lgtm

[mtomasz, 2014-05-27 23:22:26]

The CQ bit was checked by mtomasz@chromium.org

[commit-bot: I haz the power, 2014-05-27 23:23:34]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/mtomasz@chromium.org/300023008/1

[commit-bot: I haz the power, 2014-05-28 02:28:13]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  android_dbg_triggered_tests on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/android_dbg_triggered...)

[commit-bot: I haz the power, 2014-05-28 03:35:27]

Change committed as 273145