Clean up ANGLE test extension functions.

None of these functions needed to be member functions. Also make the
naming more consistent.

Bug: angleproject:3393
Change-Id: I7aafe2269a48af703a87bd9a8cf4cfab9e177dd3
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1574673
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>
diff --git a/src/tests/test_utils/MultiviewTest.h b/src/tests/test_utils/MultiviewTest.h
index ca0b35d..3d087bb 100644
--- a/src/tests/test_utils/MultiviewTest.h
+++ b/src/tests/test_utils/MultiviewTest.h
@@ -96,12 +96,12 @@
     // Requests the OVR_multiview2 extension and returns true if the operation succeeds.
     bool requestMultiviewExtension(bool requireMultiviewMultisample)
     {
-        if (extensionRequestable("GL_OVR_multiview2"))
+        if (IsGLExtensionRequestable("GL_OVR_multiview2"))
         {
             glRequestExtensionANGLE("GL_OVR_multiview2");
         }
 
-        if (!extensionEnabled("GL_OVR_multiview2"))
+        if (!IsGLExtensionEnabled("GL_OVR_multiview2"))
         {
             std::cout << "Test skipped due to missing GL_OVR_multiview2." << std::endl;
             return false;
@@ -109,16 +109,16 @@
 
         if (requireMultiviewMultisample)
         {
-            if (extensionRequestable("GL_OES_texture_storage_multisample_2d_array"))
+            if (IsGLExtensionRequestable("GL_OES_texture_storage_multisample_2d_array"))
             {
                 glRequestExtensionANGLE("GL_OES_texture_storage_multisample_2d_array");
             }
-            if (extensionRequestable("GL_ANGLE_multiview_multisample"))
+            if (IsGLExtensionRequestable("GL_ANGLE_multiview_multisample"))
             {
                 glRequestExtensionANGLE("GL_ANGLE_multiview_multisample");
             }
 
-            if (!extensionEnabled("GL_ANGLE_multiview_multisample"))
+            if (!IsGLExtensionEnabled("GL_ANGLE_multiview_multisample"))
             {
                 std::cout << "Test skipped due to missing GL_ANGLE_multiview_multisample."
                           << std::endl;