[jumbo] A global enum ResourceType appeared so rename a local one

In https://chromium-review.googlesource.com/1214980 a more visible
blink::ResourceType was introduced and when jumbo compiling that
will clash with a local one inse canvas_resource_provider.cc.

This renames that enum to CanvasResourceType just to avoid the clash.

TBR=tkent@chromium.org

Bug: 242216
Cq-Include-Trybots: luci.chromium.try:linux_layout_tests_slimming_paint_v2;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I71a9a306f7763728ae6800c78be225fd1e965bb9
Reviewed-on: https://chromium-review.googlesource.com/1224012
Commit-Queue: Daniel Bratell <bratell@opera.com>
Reviewed-by: Kent Tamura <tkent@chromium.org>
Reviewed-by: Daniel Bratell <bratell@opera.com>
Cr-Commit-Position: refs/heads/master@{#590973}
1 file changed