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This changes return type of following functions:
* SearchByTitle
* GetRemainingFileList
* AddNewDirectory
* RemoveResourceFromDirectory
* GetFileListInDirectory

Bug: 1007686
Change-Id: I4720a98a28d78d76f200535c1b4199fb5347147d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2304668Reviewed-by: Yoshiki Iguchi <yoshiki@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Josip Sokcevic <sokcevic@google.com>