Files.app: Unused string resource removal (Part 2)

List of points when they are gone:

r83169 (introduced but never used)
IDS_FILE_BROWSER_IMAGE_DIMENSIONS
IDS_FILE_BROWSER_VOLUME_LABEL
IDS_FILE_BROWSER_READ_ONLY
IDS_FILE_BROWSER_RENAME_PROMPT
IDS_FILE_BROWSER_ERROR_DELETING
r94020  IDS_FILE_BROWSER_ERROR_NEW_FOLDER_EMPTY_NAME
r106260 IDS_FILE_BROWSER_PREVIEW_COLUMN_LABEL
r106260 IDS_FILE_BROWSER_ID3_*
r110501 IDS_FILE_BROWSER_DIMENSIONS_*
r122087 IDS_FILE_BROWSER_DEVICE
r133038 IDS_FILE_BROWSER_MORE_FILES
r155723 IDS_FILE_BROWSER_CONFIRM_DELETE_* (passed as GALLERY_CONFIRM_DELETE)
r181858 IDS_FILE_BROWSER_HELP_LINK_LABEL
r231560 IDS_FILE_BROWSER_VIEW_LABEL

BUG=266228

Review URL: https://codereview.chromium.org/100633004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@239186 0039d316-1c4b-4281-b951-d872f2087c98
Create browsertests for Mode Inidicator.

BUG=246354

Review URL: https://codereview.chromium.org/103993004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@239187 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 239187