Remove Map::cleanup and Painter::cleanup

Both were noops.

include/mbgl/map/map.hpp

@@ -56,9 +56,6 @@ public:
     // Forces a map update: always triggers a rerender.
     void update();
 
-    // Triggers a cleanup that releases resources.
-    void cleanup();
-
     // Releases resources immediately
     void terminate();
 
@@ -145,7 +142,6 @@ private:
     std::thread thread;
     std::unique_ptr<uv::async> asyncTerminate;
     std::unique_ptr<uv::async> asyncRender;
-    std::unique_ptr<uv::async> asyncCleanup;
 
     // If cleared, the next time the render thread attempts to render the map, it will *actually*
     // render the map.

src/mbgl/map/map.cpp

@@ -153,7 +153,6 @@ void Map::start() {
         fileSource.clearLoop();
 
         // Closes all open handles on the loop. This means that the loop will automatically terminate.
-        asyncCleanup.reset();
         asyncRender.reset();
         asyncTerminate.reset();
     });
@@ -177,11 +176,6 @@ void Map::start() {
         }
     });
 
-    asyncCleanup = util::make_unique<uv::async>(**loop, [this]() {
-        assert(painter);
-        painter->cleanup();
-    });
-
     thread = std::thread([this]() {
 #ifndef NDEBUG
         mapThread = std::this_thread::get_id();
@@ -276,12 +270,6 @@ void Map::swapped() {
     rerender();
 }
 
-void Map::cleanup() {
-    if (asyncCleanup != nullptr) {
-        asyncCleanup->send();
-    }
-}
-
 void Map::terminate() {
     assert(painter);
     painter->terminate();

src/mbgl/renderer/painter.cpp

@@ -31,7 +31,6 @@ Painter::Painter(SpriteAtlas& spriteAtlas_, GlyphAtlas& glyphAtlas_)
 }
 
 Painter::~Painter() {
-    cleanup();
 }
 
 bool Painter::needsAnimation() const {
@@ -118,11 +117,7 @@ void Painter::deleteShaders() {
     gaussianShader = nullptr;
 }
 
-void Painter::cleanup() {
-}
-
 void Painter::terminate() {
-    cleanup();
     deleteShaders();
 }
 

src/mbgl/renderer/painter.hpp

@@ -64,8 +64,6 @@ public:
     // Perform cleanup tasks that prepare shutting down the app. This doesn't mean that the
     // app will be shut down. That means all operations must be automatically be reversed (e.g. through
     // lazy initialization) in case rendering continues.
-    void cleanup();
-
     void terminate();
 
     // Renders the backdrop of the OpenGL view. This also paints in areas where we don't have any