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

src/platform-win32.cc

Index: src/platform-win32.cc
diff --git a/src/platform-win32.cc b/src/platform-win32.cc
index d03a0a964e8496830b0a954ae9b645dc775258e2..d55cde91f879321cae8662585471a19398755664 100644
--- a/src/platform-win32.cc
+++ b/src/platform-win32.cc
@@ -1249,16 +1249,16 @@ int OS::StackWalk(Vector<OS::StackFrame> frames) {
 
     // Try to locate a symbol for this frame.
     DWORD64 symbol_displacement;
-    IMAGEHLP_SYMBOL64* symbol = NULL;
-    symbol = NewArray<IMAGEHLP_SYMBOL64>(kStackWalkMaxNameLen);
+    SmartPointer<IMAGEHLP_SYMBOL64> symbol(
+        NewArray<IMAGEHLP_SYMBOL64>(kStackWalkMaxNameLen));
     if (!symbol) return kStackWalkError;  // Out of memory.
-    memset(symbol, 0, sizeof(IMAGEHLP_SYMBOL64) + kStackWalkMaxNameLen);
+    memset(*symbol, 0, sizeof(IMAGEHLP_SYMBOL64) + kStackWalkMaxNameLen);
     symbol->SizeOfStruct = sizeof(IMAGEHLP_SYMBOL64);
     symbol->MaxNameLength = kStackWalkMaxNameLen;
     ok = _SymGetSymFromAddr64(process_handle,             // hProcess
                               stack_frame.AddrPC.Offset,  // Address
                               &symbol_displacement,       // Displacement
-                              symbol);                    // Symbol
+                              *symbol);                   // Symbol
     if (ok) {
       // Try to locate more source information for the symbol.
       IMAGEHLP_LINE64 Line;
@@ -1294,11 +1294,9 @@ int OS::StackWalk(Vector<OS::StackFrame> frames) {
       // module will never be found).
       int err = GetLastError();
       if (err != ERROR_MOD_NOT_FOUND) {
-        DeleteArray(symbol);
         break;
       }
     }
-    DeleteArray(symbol);
 
     frames_count++;
   }