tools/gn: Change auto to not deduce raw pointers.

tools/gn/builder.cc

Index: tools/gn/builder.cc
diff --git a/tools/gn/builder.cc b/tools/gn/builder.cc
index 036d3902c707ff2e183059d94bd223553d8866b8..93aec154fa6f4d7d2d091ae8fce324d70ffcfc02 100644
--- a/tools/gn/builder.cc
+++ b/tools/gn/builder.cc
@@ -33,7 +33,7 @@ typedef BuilderRecord::BuilderRecordSet BuilderRecordSet;
 bool RecursiveFindCycle(const BuilderRecord* search_in,
                         std::vector<const BuilderRecord*>* path) {
   path->push_back(search_in);
-  for (const auto& cur : search_in->unresolved_deps()) {
+  for (auto* cur : search_in->unresolved_deps()) {
     std::vector<const BuilderRecord*>::iterator found =
         std::find(path->begin(), path->end(), cur);
     if (found != path->end()) {
@@ -182,7 +182,7 @@ bool Builder::CheckForBadItems(Err* err) const {
       bad_records.push_back(src);
 
       // Check dependencies.
-      for (const auto& dest : src->unresolved_deps()) {
+      for (auto* dest : src->unresolved_deps()) {
         if (!dest->item()) {
           depstring += src->label().GetUserVisibleName(true) +
               "\n  needs " + dest->label().GetUserVisibleName(true) + "\n";
@@ -204,7 +204,7 @@ bool Builder::CheckForBadItems(Err* err) const {
       // Something's very wrong, just dump out the bad nodes.
       depstring = "I have no idea what went wrong, but these are unresolved, "
           "possibly due to an\ninternal error:";
-      for (const auto& bad_record : bad_records) {
+      for (auto* bad_record : bad_records) {
         depstring += "\n\"" +
             bad_record->label().GetUserVisibleName(false) + "\"";
       }
@@ -252,7 +252,7 @@ bool Builder::ConfigDefined(BuilderRecord* record, Err* err) {
   // anything they depend on is actually written, the "generate" flag isn't
   // relevant and means extra book keeping. Just force load any deps of this
   // config.
-  for (const auto& cur : record->all_deps())
+  for (auto* cur : record->all_deps())
     ScheduleItemLoadIfNecessary(cur);
 
   return true;
@@ -408,7 +408,7 @@ void Builder::RecursiveSetShouldGenerate(BuilderRecord* record,
     return;  // Already set.
   record->set_should_generate(true);
 
-  for (const auto& cur : record->all_deps()) {
+  for (auto* cur : record->all_deps()) {
     if (!cur->should_generate()) {
       ScheduleItemLoadIfNecessary(cur);
       RecursiveSetShouldGenerate(cur, false);