[Retry] FileAPI: Add WebFileSystem::resolveURL

[Retry] FileAPI: Add WebFileSystem::resolveURL

NOTE: There is no change from the original patch:
https://codereview.chromium.org/23537011/

This introduces WebFileSystem::resolveURL so that resolveLocalFileSystemURL,
a member of FileSystem API, can resolve a filesystem URL for external
filesystem.

This includes:
- Cracking the given filesystem URL not in Blink side but in Chromium side so
that we can get more specific external filesystem type (e.g. SyncFileSystem).
It is necessary to resolve the external filesystem URL.
- Replacing readFileSystem with resolveURL since it's used only to resolve URLs.
- Changing the error code, and these must be correct:
(http://dev.w3.org/2009/dap/file-system/file-dir-sys.html#errors-and-exceptions)

Depends on Chromium side change:
https://codereview.chromium.org/23526076/


BUG=177137
TEST=run_webkit_tests.sh http/tests/filesystem/\*
TEST=run_webkit_tests.sh http/tests/inspector/filesystem/\*
TBR=kinuko@chromium.org,tzik@chromium.org,abarth@chromium.org

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=158278

[nhiroki, 2013-09-24 15:34:04]

TBR-ing to original reviewers (kinuko@, tzik@, abarth@)

There is no difference from the original patch.
The original was reverted due to the Chromium side issue and it has already been
fixed (http://crrev.com/224991).

[commit-bot: I haz the power, 2013-09-24 15:35:02]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/nhiroki@chromium.org/24376002/1

[commit-bot: I haz the power, 2013-09-24 15:39:37]

Change committed as 158278