Changed std::find() to ContainsValue()/ContainsKey() in src/base/*

Bug: 561800

Change-Id: I1d92457335d4ee13b7289ce3601160083702e367
Reviewed-on: https://chromium-review.googlesource.com/919021
Commit-Queue: srirama chandra sekhar <srirama.m@samsung.com>
Reviewed-by: Gabriel Charette <gab@chromium.org>
Cr-Commit-Position: refs/heads/master@{#537214}

CrOS-Libchrome-Original-Commit: 36fadc62072829d2a5f32124bda65e04f2ba6ad9
3 files changed
tree: 815413cd4d0a3bd9e522f8192390b20aa96bbd9e
  1. base/
  2. build/
  3. components/
  4. dbus/
  5. device/
  6. ipc/
  7. mojo/
  8. testing/
  9. third_party/
  10. ui/