NativeBackendKWallet::GetAllLogins should not ignore errors
Currently, if KWallet failes to respond during credential retrieval, NativeBackendKWallet::GetAllLogins just silently ignores that, unlike NativeBackendKWallet::GetLoginsList, and unlike GetAllLogins itself during presence checking.
This CL makes GetAllLogins return false whenever KWallet fails to respond, to match the rest of the NativeBackendKWallet code.
BUG=324291
Review URL: https://codereview.chromium.org/
856343003
Cr-Commit-Position: refs/heads/master@{#312344}