FilesApp: context menu Set-as-wallpaper

Use label 'Set as wallpaper' rather than 'Set wallpaper'.

Bug: 902852
Change-Id: Idcd9e6a669c9de13d9866d2fe0ed59157a8d2155
Reviewed-on: https://chromium-review.googlesource.com/c/1341281Reviewed-by: Stuart Langley <slangley@chromium.org>
Commit-Queue: Joel Hockey <joelhockey@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609159}

chrome/app/file_manager_strings.grdp

@@ -514,7 +514,7 @@
     Zip selection
   </message>
   <message name="IDS_FILE_BROWSER_SET_WALLPAPER_BUTTON_LABEL" desc="The context menu item to set wallpaper.">
-    Set wallpaper
+    Set as wallpaper
   </message>
   <message name="IDS_FILE_BROWSER_CREATE_FOLDER_SHORTCUT_BUTTON_LABEL" desc="Menu item label, creating a shortcut of the selected folder to the left nav.">
     Create shortcut

chrome/app/file_manager_strings_grdp/IDS_FILE_BROWSER_SET_WALLPAPER_BUTTON_LABEL.png.sha1

+6be7a8c43a185e225743dbf4a1b0f084693b0ef5
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