Move ANGLETest back in test_utils, leaving a proxy header for Chromium

BUG=angleproject:892

Change-Id: Ibd494813be87e996096077d6e208cc92461b8f49
Reviewed-on: https://chromium-review.googlesource.com/271154
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Tested-by: Corentin Wallez <cwallez@chromium.org>
diff --git a/src/tests/gl_tests/SimpleOperationTest.cpp b/src/tests/gl_tests/SimpleOperationTest.cpp
index 3ff2d02..c6e991f 100644
--- a/src/tests/gl_tests/SimpleOperationTest.cpp
+++ b/src/tests/gl_tests/SimpleOperationTest.cpp
@@ -6,7 +6,7 @@
 // SimpleOperationTest:
 //   Basic GL commands such as linking a program, initializing a buffer, etc.
 
-#include "end2end_tests/ANGLETest.h"
+#include "test_utils/ANGLETest.h"
 
 #include <vector>