Fix another clang warning with -Wmissing-braces in ANGLE. Clang warns if there are missing braces around a subobject initializer. The most common idiom that triggers this is: STRUCT s = {0}; which can be more simply written as: STRUCT s = {}; BUG=505297 Change-Id: Ie9f9037a1ba4b6303daa30424cdc24c1ecf18896 Reviewed-on: https://chromium-review.googlesource.com/284160 Reviewed-by: Geoff Lang <geofflang@chromium.org> Tested-by: Geoff Lang <geofflang@chromium.org>