Move fetching logic out of ApplicationManager, eliminate url mappings.

mojo/runner/shell_test_base.h

Index: mojo/runner/shell_test_base.h
diff --git a/mojo/runner/shell_test_base.h b/mojo/runner/shell_test_base.h
index f7471ae9d0d4ae89720e342fd8e29e61f1bb9024..73343a80d15409fd4410f0f36ee41452bdd288af 100644
--- a/mojo/runner/shell_test_base.h
+++ b/mojo/runner/shell_test_base.h
@@ -45,8 +45,7 @@ class ShellTestBase : public testing::Test {
   Context* shell_context() { return &shell_context_; }
 
  private:
-  // Set up the test applications so that mojo: URL resolves to those.
-  void SetUpTestApplications();
+  base::FilePath GetTestAppFilePath() const;
 
   Context shell_context_;
   base::MessageLoop message_loop_;