Fix warning about namespacing of HelloTriangle's constructor
Fix warning about namespacing of HelloTriangle's constructor

BUG=angleproject:892

Change-Id: Ib3b4eb597964c21aba01047e77a413ce19c35855
Reviewed-on: https://chromium-review.googlesource.com/268994
Reviewed-by: Jamie Madill <7e492b4f1c8458024932de3ba475cbf015424c30@chromium.org>
Tested-by: Corentin Wallez <470c533e86f4f848c98c7e11fffc2d043494a401@chromium.org>

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