Move InterfaceProvider into the shell::mojom namespace like the rest of the shell interfaces.

mojo/shell/fetcher/about_fetcher_unittest.cc

Index: mojo/shell/fetcher/about_fetcher_unittest.cc
diff --git a/mojo/shell/fetcher/about_fetcher_unittest.cc b/mojo/shell/fetcher/about_fetcher_unittest.cc
index 7ca66555f7cb6bd6c81676c22805d1a4e8d323f6..ea6e92600e1c83a52b7611d4deeeb75b9f765bc6 100644
--- a/mojo/shell/fetcher/about_fetcher_unittest.cc
+++ b/mojo/shell/fetcher/about_fetcher_unittest.cc
@@ -107,8 +107,8 @@ class AboutFetcherTest : public testing::Test {
   void ConnectAndWait(const std::string& url) {
     base::RunLoop run_loop;
 
-    InterfaceProviderPtr remote_interfaces;
-    InterfaceRequest<InterfaceProvider> remote_request =
+    shell::mojom::InterfaceProviderPtr remote_interfaces;
+    shell::mojom::InterfaceProviderRequest remote_request =
         GetProxy(&remote_interfaces);
     // This connection error handler will be called when:
     // - TestContentHandler::StartApplication() has been called (please see