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Enforce a limit on the maximum number of smbfs shares that can be
mounted by request of the user. When the limit is reached, the
user will see the message "Error mounting share. Too many SMB
shares are already mounted." in the "Add file share" dialog box.

Fixed: 1060396
Change-Id: I21467250d7c273d34591f351bc955a4e7d041a45
Test: unit_tests --gtest_filter="SmbServiceWithSmbfsTest.MountExcessiveShares"
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2100052
Commit-Queue: Josh Simmons <simmonsjosh@google.com>
Reviewed-by: Anand Mistry <amistry@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#750879}