Move chrome/test/data/gdata/testfile.txt to chrome/test/data/drive

Move chrome/test/data/gdata/testfile.txt to chrome/test/data/drive

chrome/test/data/gdata will be removed once WAPI code is removed,
hence google_apis/drive/drive_api_requests_unittest.cc should stop
using chrome/test/data/gdata/testfile.txt

BUG=412238
TEST=no change to production binary.
     google_apis_unittests should pass as before

Committed: https://crrev.com/6b0a1859436920c9f18aeb125535eeab95571454
Cr-Commit-Position: refs/heads/master@{#294121}

[satorux1, 2014-09-09 06:41:27]

satorux@chromium.org changed reviewers:
+ yoshiki@chromium.org

[yoshiki, 2014-09-10 05:21:59]

lgtm

[satorux1, 2014-09-10 05:30:15]

The CQ bit was checked by satorux@chromium.org

[commit-bot: I haz the power, 2014-09-10 05:31:15]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/satorux@chromium.org/548343004/20001

[commit-bot: I haz the power, 2014-09-10 06:23:36]

Committed patchset #2 (id:20001) as ce665dc5326cff58e5ed72247986fd3200bff575

[commit-bot: I haz the power, 2014-09-10 06:26:52]

Patchset 2 (id:??) landed as
https://crrev.com/6b0a1859436920c9f18aeb125535eeab95571454
Cr-Commit-Position: refs/heads/master@{#294121}