Centralize mojo edk initialization path for some unit tests.

extensions/test/extensions_unittests_main.cc

Index: extensions/test/extensions_unittests_main.cc
diff --git a/extensions/test/extensions_unittests_main.cc b/extensions/test/extensions_unittests_main.cc
index fd54991e23ac62d5fe2fffee22da03679906377c..c7df11011be9137eb20427c3e32d351bbbe3857f 100644
--- a/extensions/test/extensions_unittests_main.cc
+++ b/extensions/test/extensions_unittests_main.cc
@@ -16,7 +16,6 @@
 #include "extensions/common/constants.h"
 #include "extensions/common/extension_paths.h"
 #include "extensions/test/test_extensions_client.h"
-#include "mojo/edk/embedder/embedder.h"
 #include "mojo/edk/test/scoped_ipc_support.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/gl/test/gl_surface_test_support.h"
@@ -115,7 +114,6 @@ void ExtensionsTestSuite::Shutdown() {
 int main(int argc, char** argv) {
   content::UnitTestTestSuite test_suite(new ExtensionsTestSuite(argc, argv));
 
-  mojo::edk::Init();
   base::TestIOThread test_io_thread(base::TestIOThread::kAutoStart);
   mojo::edk::test::ScopedIPCSupport ipc_support(test_io_thread.task_runner());