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Change files from cpp to objc++.
CredentialProviderService will use Objective-C classes, and needs to be
converted to Objective-C++ instead of C++.

Bug: 1066803
Change-Id: Ibd74a815177cb05b84bf05ee423ad3342c02a53d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2139652
Commit-Queue: Javier Ernesto Flores Robles <javierrobles@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Auto-Submit: Javier Ernesto Flores Robles <javierrobles@chromium.org>
Cr-Commit-Position: refs/heads/master@{#757036}