tree 8d0e62522f57a6843a6e2830b6236072d5c83ee2
parent 3842e318b2175888e2fe1665d106b5653be5470b
author Daichi Hirono <hirono@google.com> 1454056656 +0900
committer Daichi Hirono <hirono@google.com> 1454056656 +0900

Return NULL available bytes when the MTP device is closed.

Before MtpDocumentsProvider opens a device, it cannot fetch the storage
size. Currently it says 0 bytes available. But actually it is unknown.

BUG=26866812

Change-Id: I3f24773da8e76fe1092c11f1335aac9703f1b3f9