Update SplitString calls to new form

ui/aura/bench/bench_main.cc

Index: ui/aura/bench/bench_main.cc
diff --git a/ui/aura/bench/bench_main.cc b/ui/aura/bench/bench_main.cc
index aa4ea4a3f52e49d79eda4c70ab3067b503c2746b..f3a058a533aa8269f1a0eb677b4507696ce23284 100644
--- a/ui/aura/bench/bench_main.cc
+++ b/ui/aura/bench/bench_main.cc
@@ -170,8 +170,8 @@ class WebGLBench : public BenchCompositorObserver {
     int width = 0;
     int height = 0;
     if (!webgl_size.empty()) {
-      std::vector<std::string> split_size;
-      base::SplitString(webgl_size, 'x', &split_size);
+      std::vector<std::string> split_size = base::SplitString(
+          webgl_size, "x", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
       if (split_size.size() == 2) {
         width = atoi(split_size[0].c_str());
         height = atoi(split_size[1].c_str());