[Android] Fix reading CPU Timestamps

https://codereview.chromium.org/85013002 broke reading CPU Timestamps
on Android by throwing away the line breaks when reading files. This
restores them.

TBR=tonyg
BUG=

Review URL: https://codereview.chromium.org/94233003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@237778 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 237778