Remove navigation_service_unittests, along with the service itself.

content/shell/browser/shell_content_browser_client.cc

Index: content/shell/browser/shell_content_browser_client.cc
diff --git a/content/shell/browser/shell_content_browser_client.cc b/content/shell/browser/shell_content_browser_client.cc
index 9daca329496b92ba7eec07a1fafd9834fb10e0c0..0aeb7e2af3fa9f8484eaf16de1e265880eb70f83 100644
--- a/content/shell/browser/shell_content_browser_client.cc
+++ b/content/shell/browser/shell_content_browser_client.cc
@@ -68,10 +68,6 @@
 #include "media/mojo/services/media_service_factory.h"  // nogncheck
 #endif
 
-#if defined(USE_AURA)
-#include "services/navigation/navigation.h"
-#endif
-
 namespace content {
 
 namespace {
@@ -205,13 +201,6 @@ void ShellContentBrowserClient::RegisterInProcessServices(
     services->insert(std::make_pair("media", info));
   }
 #endif
-#if defined(USE_AURA)
-  {
-    content::ServiceInfo info;
-    info.factory = base::Bind(&navigation::CreateNavigationService);
-    services->insert(std::make_pair("navigation", info));
-  }
-#endif
 }
 
 void ShellContentBrowserClient::RegisterOutOfProcessServices(