[core] Fix modernize-use-override errors in header files

As reported by clang-tidy-8.

3 files changed, 3 insertions, 3 deletions

diff --git a/src/mbgl/gl/index_buffer_resource.hpp b/src/mbgl/gl/index_buffer_resource.hpp
index 00c66be5b5..4187994a22 100644
--- a/src/mbgl/gl/index_buffer_resource.hpp
+++ b/src/mbgl/gl/index_buffer_resource.hpp
@@ -9,7 +9,7 @@ namespace gl {
 class IndexBufferResource : public gfx::IndexBufferResource {
 public:
     IndexBufferResource(UniqueBuffer&& buffer_, int byteSize_) : buffer(std::move(buffer_)), byteSize(byteSize_) {}
-    ~IndexBufferResource();
+    ~IndexBufferResource() override;
 
     UniqueBuffer buffer;
     int byteSize;
diff --git a/src/mbgl/gl/texture_resource.hpp b/src/mbgl/gl/texture_resource.hpp
index 494e5ae8a3..fd4f69084f 100644
--- a/src/mbgl/gl/texture_resource.hpp
+++ b/src/mbgl/gl/texture_resource.hpp
@@ -9,7 +9,7 @@ namespace gl {
 class TextureResource : public gfx::TextureResource {
 public:
     TextureResource(UniqueTexture&& texture_, int byteSize_) : texture(std::move(texture_)), byteSize(byteSize_) {}
-    ~TextureResource();
+    ~TextureResource() override;
 
     static int getStorageSize(const Size& size, gfx::TexturePixelType format, gfx::TextureChannelDataType type);
 
diff --git a/src/mbgl/gl/vertex_buffer_resource.hpp b/src/mbgl/gl/vertex_buffer_resource.hpp
index f9c599c757..cbd73482a3 100644
--- a/src/mbgl/gl/vertex_buffer_resource.hpp
+++ b/src/mbgl/gl/vertex_buffer_resource.hpp
@@ -9,7 +9,7 @@ namespace gl {
 class VertexBufferResource : public gfx::VertexBufferResource {
 public:
     VertexBufferResource(UniqueBuffer&& buffer_, int byteSize_) : buffer(std::move(buffer_)), byteSize(byteSize_) {}
-    ~VertexBufferResource();
+    ~VertexBufferResource() override;
 
     UniqueBuffer buffer;
     int byteSize;