Do not explicitly use --force-compositing-mode in memory/throughput tests; use the default config f…

chrome/test/perf/rendering/throughput_tests.cc

Index: chrome/test/perf/rendering/throughput_tests.cc
diff --git a/chrome/test/perf/rendering/throughput_tests.cc b/chrome/test/perf/rendering/throughput_tests.cc
index 53b6dc560cbcd8d652e6d6810e03e1e5835687c9..8b339a6a4134dbb26379084d7921246b02313d56 100644
--- a/chrome/test/perf/rendering/throughput_tests.cc
+++ b/chrome/test/perf/rendering/throughput_tests.cc
@@ -193,9 +193,7 @@ class ThroughputTest : public BrowserPerfTest {
     command_line->AppendSwitch(switches::kDisableGpuVsync);
     command_line->AppendSwitch(switches::kAllowFileAccessFromFiles);
     // Enable or disable GPU acceleration.
-    if (use_gpu_) {
-      command_line->AppendSwitch(switches::kForceCompositingMode);
-    } else {
+    if (!use_gpu_) {
       command_line->AppendSwitch(switches::kDisableAcceleratedCompositing);
       command_line->AppendSwitch(switches::kDisableExperimentalWebGL);
       command_line->AppendSwitch(switches::kDisableAccelerated2dCanvas);