File Manager: Add 'New Folder' button, fix sorting, assorted polish

file_manager.css:
* Smaller margin in header to account for buttons.
* No padding on sort image for the 'icon type' column.
* Add icon for folders

file_manager.js:
* Cache data for the sort column *just* before sorting.
* Scan DOM for 'visibleif' attributes to control visibility of DialogType specific elements.
* Add 'New Folder' functionality.
* Add new 'Icon Type' column so that files can be sorted by type.  This column is a slightly special case because it has no label.
* Scroll selected items back into view after a sort.
* Remove leading '/' in virtual path passed in to selectFile(s).

mock_chrome.js:
* Remove unused strings.
* Add new strings.

util.js:
* Refactor FileError.p.toString code so that callers can get a error mnemonic without the surrounding '[object ...]' string.

main.html:
* Add 'New folder' button.
* Switch filename label/input to use visibleif attribute.

generated_resources.grd:
* Update strings

extension_file_browser_private_api.cc:
* Update strings.
* Add local macro to reduce copy-pasta overload.

BUG=chromium-os:14011
TEST=manual testing in harness and chromeos-chrome build

Review URL: http://codereview.chromium.org/6827001

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@81160 0039d316-1c4b-4281-b951-d872f2087c98

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