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According to the TODOs left in the code and the state of crbug/803102,
it is now safe to remove the params.IsValid() from some if-statements.
This is so, when the paramters are passed through Mojo, which will
already perform the checks.

To guarantee that all is working correctly, the check is transfromed
into a DCHECK.

BUG=803102

Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
Change-Id: I069a902141d8003f2bb9656f691b5bbbdb69c259
Reviewed-on: https://chromium-review.googlesource.com/1181134Reviewed-by: Max Morin <maxmorin@chromium.org>
Commit-Queue: Armando Miraglia <armax@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584703}