Do IWYU for base/containers/contains.h in various directories.

Include base/containers/contains.h in various files that use
base::Contains().

Bug: 970209
Change-Id: I8ed8e70509155058bd3d1b2c4878129f266fbf22
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2901022
Owners-Override: Lei Zhang <thestig@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#883799}
NOKEYCHECK=True
GitOrigin-RevId: 812c539850a0227ba4792084d5a80ee013523b0c

leveldatabase/leveldb_chrome.cc

@@ -9,6 +9,7 @@
 #include <vector>
 
 #include "base/bind.h"
+#include "base/containers/contains.h"
 #include "base/containers/flat_set.h"
 #include "base/files/file.h"
 #include "base/files/file_util.h"