Make the SandboxSymbolizeHelper Singleton Leaky and Enable Impacted Test

base/debug/stack_trace_posix.cc

Index: base/debug/stack_trace_posix.cc
diff --git a/base/debug/stack_trace_posix.cc b/base/debug/stack_trace_posix.cc
index fc3ee14c7b9d60958ad6d6000d94cbc616b6c7df..27a656e6caffe7a3efc58fda7c4758b5d7fcdf77 100644
--- a/base/debug/stack_trace_posix.cc
+++ b/base/debug/stack_trace_posix.cc
@@ -444,8 +444,6 @@ void WarmUpBacktrace() {
   StackTrace stack_trace;
 }
 
-}  // namespace
-
 #if defined(USE_SYMBOLIZE)
 
 // class SandboxSymbolizeHelper.
@@ -461,7 +459,8 @@ class SandboxSymbolizeHelper {
  public:
   // Returns the singleton instance.
   static SandboxSymbolizeHelper* GetInstance() {
-    return Singleton<SandboxSymbolizeHelper>::get();
+    return Singleton<SandboxSymbolizeHelper,
+                     LeakySingletonTraits<SandboxSymbolizeHelper>>::get();
   }
 
  private:
@@ -677,6 +676,8 @@ class SandboxSymbolizeHelper {
 };
 #endif  // USE_SYMBOLIZE
 
+}  // namespace
+
 bool EnableInProcessStackDumping() {
 #if defined(USE_SYMBOLIZE)
   SandboxSymbolizeHelper::GetInstance();