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This CL replaces most MockTimer with MockOneShotTimer or
MockRepeatingTimer as a preparation of OnceCallback support of
base::Timer.

Bug: 850247
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:ios-simulator-full-configs;luci.chromium.try:linux_mojo;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:linux_vr;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: I949bc78c5e103baa610a8a2d1197901ceb090c50
Reviewed-on: https://chromium-review.googlesource.com/1105812
Commit-Queue: Taiju Tsuiki <tzik@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Yutaka Hirano <yhirano@chromium.org>
Reviewed-by: Joshua Bell <jsbell@chromium.org>
Reviewed-by: Gabriel Charette <gab@chromium.org>
Reviewed-by: Lambros Lambrou <lambroslambrou@chromium.org>
Cr-Commit-Position: refs/heads/master@{#572509}