Optimize RTL check in ICU to avoid mmap access.

Experiment suggests that we can improve Extensions.ExtensionServiceInitTime
by 15% @ the 75-th percentile by avoiding this mmap access.

Review URL: https://codereview.chromium.org/1281343003

Cr-Commit-Position: refs/heads/master@{#342949}


CrOS-Libchrome-Original-Commit: 399f02b7d4ba8d3ce8c2f7e4245c9bd992f5c8a0
3 files changed
tree: f9e1ccf2bb1ca76e497b1ebc704a4862d5ba60b0
  1. base/
  2. build/
  3. components/
  4. dbus/
  5. device/
  6. ipc/
  7. mojo/
  8. testing/
  9. third_party/
  10. ui/