Fix two -Wrange-loop-analysis warnings.

Change-Id: I7ff59507696e28ae65c7e2e22659debd731f788a
Reviewed-on: https://gn-review.googlesource.com/c/gn/+/9260
Reviewed-by: Brett Wilson <brettw@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>

src/base/values.cc

diff --git a/src/base/values.cc b/src/base/values.cc
index d660365..25b10e3 100644
--- a/src/base/values.cc
+++ b/src/base/values.cc
@@ -311,7 +311,7 @@
 
 const Value* Value::FindPath(span<const std::string_view> path) const {
   const Value* cur = this;
-  for (const std::string_view component : path) {
+  for (const std::string_view& component : path) {
     if (!cur->is_dict() || (cur = cur->FindKey(component)) == nullptr)
       return nullptr;
   }

src/gn/input_conversion.cc

diff --git a/src/gn/input_conversion.cc b/src/gn/input_conversion.cc
index 46d3dde..e82a939 100644
--- a/src/gn/input_conversion.cc
+++ b/src/gn/input_conversion.cc
@@ -138,7 +138,7 @@
       return Value();
     case base::Value::Type::DICTIONARY: {
       std::unique_ptr<Scope> scope = std::make_unique<Scope>(settings);
-      for (const auto& it : value.DictItems()) {
+      for (auto it : value.DictItems()) {
         Value parsed_value =
             ParseJSONValue(settings, it.second, origin, input_file, err);
         if (!IsIdentifier(it.first)) {