Use conservative permissions when creating files in ART Use 644 permissions by default so that only the owner has write-rights. Bug: 130821293 Test: host run-test & gtest Merged-In: I09eab9749d1ce5872ecaf7d5a80fc45c9c708853 Change-Id: Ic4dae399a5bfe862aff3d8614c45b38044d805db (cherry picked from commit d224e964bd0de231c72008547b0246a2f70048ee)