[Android]: Remove __system_property_get(ro.build.fingerprint) from WriteOSInformation.

__system_property_get has been removed from the Android NDK for 'L' so Breakpad
no longer links. This CL just removes the call in WriteOSInformation because
Chrome already passes the build fingerprint as a crash key called "android_build_fp" in the crash report HTTP POST message.

BUG=394841,393903
R=mark@chromium.org

Review URL: https://breakpad.appspot.com/1694002

git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@1351 4c0a9323-5329-0410-9bdc-e9ce6186880e