Right-size the bool array in WebGLRenderingContextBase::getUniform.

There can only be four (as evidenced by the GLint array it is populated from).

Change-Id: I1bcbf4197c520bcdc02d553d1fb3c3f7bf9b428b
Reviewed-on: https://chromium-review.googlesource.com/c/1301956Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Jeremy Roman <jbroman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#603144}

third_party/blink/renderer/modules/webgl/webgl_rendering_context_base.cc

@@ -3852,7 +3852,7 @@ ScriptValue WebGLRenderingContextBase::getUniform(
             GLint value[4] = {0};
             ContextGL()->GetUniformiv(ObjectOrZero(program), location, value);
             if (length > 1) {
-              bool bool_value[16] = {0};
+              bool bool_value[4] = {0};
               for (unsigned j = 0; j < length; j++)
                 bool_value[j] = static_cast<bool>(value[j]);
               return WebGLAny(script_state, bool_value, length);