[fuchsia] actually clean up lock file in release mode
[fuchsia] actually clean up lock file in release mode

* the call to LoggingRemoveFile wrapped ina DCHECK is actually only executed in debug mode :-(
* found the issue using zxdb!

Bug: fuchsia:DX-344
Bug: crashpad:217, crashpad:196
Change-Id: I5332a17ccffd94b9bad8c61831adb797bd53a13d
Tested:`crasher` on device
Reviewed-on: https://chromium-review.googlesource.com/c/1364452
Reviewed-by: Mark Mentovai <f1b5a91d4d6ad523f2610114591c007e75d15084@chromium.org>
Reviewed-by: Scott Graham <e134406e1863f3b48b0795831afac5c0595efb36@chromium.org>
Commit-Queue: Francois Rousseau <abdb75be6d92482eb3ea75e9341306a6fcc3aacd@google.com>

chromium/crashpad,chromium/crashpad,chromium/crashpad