Rename data_dir to angle_data_dir in GN files Dawn reuses the Vulkan validation layers of ANGLE to avoid building twice in chromium, and references build_overrides/vulkan_common.gni, but angle_data_dir is undefined, which is defined as data_dir in angle.gni. There is a reminder to rename this name in https://chromium-review.googlesource.com/c/chromium/src/+/1610488 Bug: angleproject:3710 Change-Id: I4b7c4d24c37770ff58b70c988851a6ed32a04296 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1703175 Reviewed-by: Yuly Novikov <ynovikov@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Yuly Novikov <ynovikov@chromium.org>