Rework ExtensionApiUnittest to run in extensions_unittests, removing its Chrome dependencies.

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 50b02473960427514dae976f50e7a3107adf46c2..ff7f4a9d6c0c19da99f1d3daf26941c8c4cf91a5 100644
--- a/extensions/test/extensions_unittests_main.cc
+++ b/extensions/test/extensions_unittests_main.cc
@@ -16,6 +16,10 @@
 #include "mojo/embedder/embedder.h"
 #include "ui/base/resource/resource_bundle.h"
 
+#if !defined(OS_IOS)
+#include "ui/gl/gl_surface.h"
+#endif
+
 namespace {
 
 // Content client that exists only to register chrome-extension:// scheme with
@@ -65,6 +69,10 @@ ExtensionsTestSuite::~ExtensionsTestSuite() {}
 void ExtensionsTestSuite::Initialize() {
   content::ContentTestSuiteBase::Initialize();
 
+#if !defined(OS_IOS)
+  gfx::GLSurface::InitializeOneOffForTests();
+#endif
+
   // Register the chrome-extension:// scheme via this circuitous path. Note
   // that this does not persistently set up a ContentClient; individual tests
   // must use content::SetContentClient().