[core] Fix performance-unnecessary-value-param errors in header files

As reported by clang-tidy-8.

1 files changed, 3 insertions, 3 deletions

diff --git a/platform/default/src/mbgl/map/map_snapshotter.cpp b/platform/default/src/mbgl/map/map_snapshotter.cpp
index 2b60095d7c..2d73fd4bec 100644
--- a/platform/default/src/mbgl/map/map_snapshotter.cpp
+++ b/platform/default/src/mbgl/map/map_snapshotter.cpp
@@ -39,8 +39,8 @@ public:
         delegate.invoke(&RendererObserver::onDidFinishRenderingFrame, mode, repaintNeeded, placementChanged);
     }
 
-    void onStyleImageMissing(const std::string& image, StyleImageMissingCallback cb) override {
-        delegate.invoke(&RendererObserver::onStyleImageMissing, image, std::move(cb));
+    void onStyleImageMissing(const std::string& image, const StyleImageMissingCallback& cb) override {
+        delegate.invoke(&RendererObserver::onStyleImageMissing, image, cb);
     }
 
 private:
@@ -76,7 +76,7 @@ public:
         rendererObserver->onDidFinishRenderingFrame(mode, repaintNeeded, placementChanged);
     }
 
-    void onStyleImageMissing(const std::string& id, StyleImageMissingCallback done) override {
+    void onStyleImageMissing(const std::string& id, const StyleImageMissingCallback& done) override {
         rendererObserver->onStyleImageMissing(id, done);
     }