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This change completes the implementation of
PpdProvider::ResolvePpdReference(). Note that
PpdProviderTest.CaseInsensitiveMakeAndModel does not yet pass, as
it exercises other unimplemented methods.

Bug: chromium:888189
Test: chromeos_unittests --gtest_filter='PpdProvider.RepeatedMakeModel'
Test: chromeos_unittests --gtest_filter='PpdProvider.UsbResolution'
Test: chromeos_unittests --gtest_filter='PpdProvider.ResolveUsbManufacturer'
Change-Id: Iea05ee2e8cb4fd5c86343ca0f14848dcf42dee60
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2354907
Commit-Queue: Kalvin Lee <kdlee@chromium.org>
Reviewed-by: Luum Habtemariam <luum@chromium.org>
Cr-Commit-Position: refs/heads/master@{#804096}