Rename traits and mojo directory in //services/viz/privileged

This CL renames mojo to mojom and *_struct_traits.* to
*_mojom_traits.* in //services/viz/privileged.

*_struct_traits.* => *_mojom_traits.*
services/viz/privileged/interfaces => services/viz/privileged/mojom

Bug: 806965
Change-Id: I5ab3e9200b2a9eb31651a416e55d2110434e803a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1715171
Commit-Queue: Miyoung Shin <[email protected]>
Reviewed-by: Kinuko Yasuda <[email protected]>
Reviewed-by: John Abd-El-Malek <[email protected]>
Reviewed-by: enne <[email protected]>
Cr-Commit-Position: refs/heads/master@{#681639}
diff --git a/content/gpu/BUILD.gn b/content/gpu/BUILD.gn
index 29e78fe..ee4cb155 100644
--- a/content/gpu/BUILD.gn
+++ b/content/gpu/BUILD.gn
@@ -83,7 +83,7 @@
     "//services/shape_detection:lib",
     "//services/shape_detection/public/mojom",
     "//services/tracing/public/cpp",
-    "//services/viz/privileged/interfaces",
+    "//services/viz/privileged/mojom",
     "//skia",
     "//third_party/angle:angle_gpu_info_util",
     "//ui/gfx/ipc",