Do not use components/arc/common in non CrOs builds

I found that (at least win) bots are using components/arc/common
stuff (see e.g. [1]), when this are supposed to be limited to
CrOs.  This CL corrects that by sandwiching the appropriate
BUILD entries between if(is_chromeos).

[1] https://logs.chromium.org/logs/chromium/buildbucket/cr-buildbucket.appspot.com/8936282730877054816/+/steps/compile/0/stdout
/BUILD.gn mojom(media)

Bug: 732531
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel
Change-Id: Ic0e807b5b97d1aadd5736377188456634424647d
Reviewed-on: https://chromium-review.googlesource.com/1208410Reviewed-by: Luis Hector Chavez <lhchavez@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Reviewed-by: kylechar <kylechar@chromium.org>
Commit-Queue: Miguel Casas <mcasas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#589056}

components/arc/common/BUILD.gn

@@ -81,22 +81,23 @@ if (is_chromeos) {
       ":media",  # for gfx.mojom
     ]
   }
-}
 
-# Media related mojo interfaces. There are used by //services/ws/public/mojom.
-# We have this separate mojom target to avoid pulling in unnecessary interfaces.
-mojom("media") {
-  sources = [
-    "gfx.mojom",
-    "protected_buffer_manager.mojom",
-    "video.mojom",
-    "video_common.mojom",
-    "video_decode_accelerator.mojom",
-    "video_encode_accelerator.mojom",
-    "video_protected_buffer_allocator.mojom",
-  ]
+  # Media related mojo interfaces. There are used by //services/ws/public/mojom.
+  # We have this separate mojom target to avoid pulling in unnecessary
+  # interfaces.
+  mojom("media") {
+    sources = [
+      "gfx.mojom",
+      "protected_buffer_manager.mojom",
+      "video.mojom",
+      "video_common.mojom",
+      "video_decode_accelerator.mojom",
+      "video_encode_accelerator.mojom",
+      "video_protected_buffer_allocator.mojom",
+    ]
 
-  public_deps = [
-    "//ui/gfx/geometry/mojo",
-  ]
+    public_deps = [
+      "//ui/gfx/geometry/mojo",
+    ]
+  }
 }

services/viz/privileged/interfaces/gl/BUILD.gn

@@ -12,11 +12,13 @@ mojom("gl") {
   ]
 
   public_deps = [
-    "//components/arc/common:media",
     "//gpu/ipc/common:interfaces",
     "//media/mojo/interfaces",
     "//ui/gfx/geometry/mojo",
     "//ui/gfx/mojo",
     "//url/mojom:url_mojom_gurl",
   ]
+  if (is_chromeos) {
+    public_deps += [ "//components/arc/common:media" ]
+  }
 }