[core] Remove unused

src/mbgl/map/transform_state.cpp

@@ -68,10 +68,6 @@ box TransformState::cornersToBox(uint32_t z) const {
 
 #pragma mark - Dimensions
 
-bool TransformState::hasSize() const {
-    return width && height;
-}
-
 uint16_t TransformState::getWidth() const {
     return width;
 }

src/mbgl/map/transform_state.hpp

@@ -30,7 +30,6 @@ public:
     box cornersToBox(uint32_t z) const;
 
     // Dimensions
-    bool hasSize() const;
     uint16_t getWidth() const;
     uint16_t getHeight() const;