Link VPX into GN build more.

These cases were commented out (VPX used to not work). They should now match the GYP build. I think these deps aren't strictly necessary because dependent targets link vpx in, but it's a good idea to match GYP, and I think this will make the header checker happier.

R=jamesr@chromium.org

Review URL: https://codereview.chromium.org/610703002

Cr-Commit-Position: refs/heads/master@{#297039}

content/test/BUILD.gn

@@ -117,7 +117,7 @@ static_library("test_support") {
     }
 
     if (!is_android && !is_ios) {
-      #deps += [ "//third_party/libvpx" ]  TODO(GYP)
+      deps += [ "//third_party/libvpx" ]
     }
 
     if (is_android) {

remoting/base/BUILD.gn

@@ -78,7 +78,7 @@ static_library("base") {
     "//media",
     "//media:shared_memory_support",
     "//remoting/resources",
-    #"//third_party/libvpx",  TODO(GYP)
+    "//third_party/libvpx",
     "//third_party/libyuv",
     "//third_party/opus",
     "//third_party/webrtc/modules/desktop_capture",
@@ -86,6 +86,5 @@ static_library("base") {
     "//ui/gfx",
     "//ui/gfx/geometry",
   ]
-
 }