Use conservative permissions when creating files in ART
am: d224e964bd

Change-Id: I084a7c031c215ce9a18dbcccff42fd9d64fb6e01
(cherry picked from commit 70c59234bcd15f848eb06496d1ac0480a52fb978)

libartbase/base/os_linux.cc

diff --git a/libartbase/base/os_linux.cc b/libartbase/base/os_linux.cc
index cb228bd..c972f8f 100644
--- a/libartbase/base/os_linux.cc
+++ b/libartbase/base/os_linux.cc
@@ -57,7 +57,8 @@
   CHECK(name != nullptr);
   bool read_only = ((flags & O_ACCMODE) == O_RDONLY);
   bool check_usage = !read_only && auto_flush;
-  std::unique_ptr<File> file(new File(name, flags, 0666, check_usage));
+  std::unique_ptr<File> file(
+      new File(name, flags, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH, check_usage));
   if (!file->IsOpened()) {
     return nullptr;
   }