Add a basic browser to mash that uses the navigation service.

services/navigation/content_client/main_delegate.cc

Index: services/navigation/content_client/main_delegate.cc
diff --git a/services/navigation/content_client/main_delegate.cc b/services/navigation/content_client/main_delegate.cc
index 28bd258e204647ad760f03ac81a7fd7fb798f466..82928ba15544f3547fcd9cd13e8726b2b91e68c2 100644
--- a/services/navigation/content_client/main_delegate.cc
+++ b/services/navigation/content_client/main_delegate.cc
@@ -29,6 +29,11 @@ bool MainDelegate::BasicStartupComplete(int* exit_code) {
 }
 
 void MainDelegate::PreSandboxStartup() {
+  base::FilePath path;
+  PathService::Get(base::DIR_MODULE, &path);
+  base::FilePath pak_path =
+      path.Append(FILE_PATH_LITERAL("navigation.pak"));
+  ui::ResourceBundle::InitSharedInstanceWithPakPath(pak_path);
   ui::InitializeInputMethodForTesting();
 }