[C4A] Remove NavigationEntryTest.NavigationEntryURLs test on audio builds.

Audio only devices have no way to display a URL, so unittest is irrelevant.

BUG= internal b/32972133
TEST= content_unittests

Change-Id: Ic901fdba822b042726d2f26a3cb07413652d7157
Review-Url: https://codereview.chromium.org/2563833002
Cr-Commit-Position: refs/heads/master@{#437698}

chromecast/BUILD.gn

@@ -139,12 +139,13 @@ cast_test_group("cast_tests") {
 
   content_unittests_filter = {
     test_name = "content_unittests"
+    gtest_excludes = []
     if (target_os == "linux" && !is_cast_desktop_build) {
       # DesktopCaptureDeviceTest.*: No capture device on Eureka
       # Disable PepperGamepadHostTest.WaitForReply (pepper not supported on Eureka)
       # Disable GpuDataManagerImplPrivateTest.SetGLStrings and
       # RenderWidgetHostTest.Background because we disable the blacklist to enable WebGL (b/16142554)
-      gtest_excludes = [
+      gtest_excludes += [
         "DOMStorageDatabaseTest.TestCanOpenAndReadWebCoreDatabase",
         "DesktopCaptureDeviceTest.Capture",
         "GamepadProviderTest.PollingAccess",
@@ -153,6 +154,10 @@ cast_test_group("cast_tests") {
         "RenderWidgetHostTest.Background",
       ]
     }
+    if (is_cast_audio_only) {
+      # No way to display URL's on audio only cast devices.
+      gtest_excludes += [ "NavigationEntryTest.NavigationEntryURLs" ]
+    }
   }
   filters += [ content_unittests_filter ]