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

tools/gn/command_refs.cc

Index: tools/gn/command_refs.cc
diff --git a/tools/gn/command_refs.cc b/tools/gn/command_refs.cc
index 413a98f89c74d65d84c3c56ce319fa76e90218d3..014d7e8996dc08ec62b598a99fc06b3141a081cc 100644
--- a/tools/gn/command_refs.cc
+++ b/tools/gn/command_refs.cc
@@ -32,7 +32,7 @@ typedef std::multimap<const Target*, const Target*> DepMap;
 
 // Populates the reverse dependency map for the targets in the Setup.
 void FillDepMap(Setup* setup, DepMap* dep_map) {
-  for (const auto& target : setup->builder()->GetAllResolvedTargets()) {
+  for (auto* target : setup->builder()->GetAllResolvedTargets()) {
     for (const auto& dep_pair : target->GetDeps(Target::DEPS_ALL))
       dep_map->insert(std::make_pair(dep_pair.ptr, target));
   }
@@ -160,7 +160,7 @@ void GetTargetsContainingFile(Setup* setup,
                               bool all_toolchains,
                               UniqueVector<const Target*>* matches) {
   Label default_toolchain = setup->loader()->default_toolchain_label();
-  for (const auto& target : all_targets) {
+  for (auto* target : all_targets) {
     if (!all_toolchains) {
       // Only check targets in the default toolchain.
       if (target->label().GetToolchainLabel() != default_toolchain)
@@ -189,7 +189,7 @@ void GetTargetsReferencingConfig(Setup* setup,
                                  bool all_toolchains,
                                  UniqueVector<const Target*>* matches) {
   Label default_toolchain = setup->loader()->default_toolchain_label();
-  for (const auto& target : all_targets) {
+  for (auto* target : all_targets) {
     if (!all_toolchains) {
       // Only check targets in the default toolchain.
       if (target->label().GetToolchainLabel() != default_toolchain)
@@ -442,7 +442,7 @@ int RunRefs(const std::vector<std::string>& args) {
     GetTargetsContainingFile(setup, all_targets, file, all_toolchains,
                              &explicit_target_matches);
   }
-  for (const auto& config : config_matches) {
+  for (auto* config : config_matches) {
     GetTargetsReferencingConfig(setup, all_targets, config, all_toolchains,
                                 &explicit_target_matches);
   }