Safer and simpler alternative to cbfa4bf.

See #16483

GPU/Vulkan/GPU_Vulkan.h

@@ -51,7 +51,6 @@ public:
 	void ExecuteOp(u32 op, u32 diff) override;
 
 	void GetStats(char *buffer, size_t bufsize) override;
-	void ClearCacheNextFrame() override;
 	void DeviceLost() override;  // Only happens on Android. Drop all textures and shaders.
 	void DeviceRestore() override;