Turn some usages of NewArray with DeleteArray in the same scope into ScopedVector or SmartPointer.

src/platform-freebsd.cc

Index: src/platform-freebsd.cc
diff --git a/src/platform-freebsd.cc b/src/platform-freebsd.cc
index 67e52ce9479cabd209e347c04cca680299641e28..b1075cf3217d5d5ab3bfba65acb8d92657da7290 100644
--- a/src/platform-freebsd.cc
+++ b/src/platform-freebsd.cc
@@ -286,14 +286,12 @@ void OS::LogSharedLibraryAddresses() {
 
 int OS::StackWalk(Vector<OS::StackFrame> frames) {
   int frames_size = frames.length();
-  void** addresses = NewArray<void*>(frames_size);
+  ScopedVector<void*> addresses(frames_size);
 
-  int frames_count = backtrace(addresses, frames_size);
+  int frames_count = backtrace(addresses.start(), frames_size);
 
-  char** symbols;
-  symbols = backtrace_symbols(addresses, frames_count);
+  char** symbols = backtrace_symbols(addresses, frames_count);
   if (symbols == NULL) {
-    DeleteArray(addresses);
     return kStackWalkError;
   }
 
@@ -308,7 +306,6 @@ int OS::StackWalk(Vector<OS::StackFrame> frames) {
     frames[i].text[kStackWalkMaxTextLen - 1] = '\0';
   }
 
-  DeleteArray(addresses);
   free(symbols);
 
   return frames_count;