vectors are cleared with "clear()", not with "empty()".

chrome/browser/process_singleton_uitest.cc

Index: chrome/browser/process_singleton_uitest.cc
diff --git a/chrome/browser/process_singleton_uitest.cc b/chrome/browser/process_singleton_uitest.cc
index 70f81615a0e980e399776176bbbebc2ef6bf49e9..e57fe0c784a40c02e8e76cea44a110e5b8401a83 100644
--- a/chrome/browser/process_singleton_uitest.cc
+++ b/chrome/browser/process_singleton_uitest.cc
@@ -315,7 +315,7 @@ TEST_F(ProcessSingletonTest, MAYBE_StartupRaceCondition) {
     // "There can be only one!" :-)
     ASSERT_EQ(static_cast<size_t>(1), pending_starters.size());
     size_t last_index = pending_starters.front();
-    pending_starters.empty();
+    pending_starters.clear();
     if (chrome_starters_[last_index]->process_handle_ !=
         base::kNullProcessHandle) {
       KillProcessTree(chrome_starters_[last_index]->process_handle_);