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Enable DCHECKs in Lock and ConditionVariable when compiled
with dchecks_always_on.

Note the correctness of DCHECKs relies on DCHECKs enabled
in both Lock and ConditionVariable. This CL keeps the
condition to enable DCHECKs in ConditionVariable the
same as Lock, to avoid any issues here.

BUG=

Review URL: https://codereview.chromium.org/403803004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@284534 0039d316-1c4b-4281-b951-d872f2087c98