Restrict memory maps dump provider to only android and linux

The memory maps dump provider is used only in android and linux, and
not yet supported in windows. So, this should be compiled only in linux
and android.

BUG=461788

Review URL: https://codereview.chromium.org/1391933002

Cr-Original-Commit-Position: refs/heads/master@{#353029}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: cf0bd979e8594b8fe369ed3177038cb06c05f05b
1 file changed
tree: 7e24d4ee961e9609b2abb86526d080e990c4a180
  1. tools/