Correctly destroy returned front buffer after resize

gpu/command_buffer/service/gles2_cmd_decoder.cc

Index: gpu/command_buffer/service/gles2_cmd_decoder.cc
diff --git a/gpu/command_buffer/service/gles2_cmd_decoder.cc b/gpu/command_buffer/service/gles2_cmd_decoder.cc
index 15aa3b1b5ccaa43ffb265c37ab831e00dfac50ad..9295ee0eb3ba106aa8eedfefe5beb90357e1db56 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder.cc
+++ b/gpu/command_buffer/service/gles2_cmd_decoder.cc
@@ -4938,7 +4938,10 @@ void GLES2DecoderImpl::ReturnFrontBuffer(const Mailbox& mailbox, bool is_lost) {
       continue;
 
     if (is_lost || it->back_texture->size() != offscreen_size_) {
-      it->back_texture->Invalidate();
+      if (is_lost)
+        it->back_texture->Invalidate();
+      else
+        it->back_texture->Destroy();
       saved_back_textures_.erase(it);
       return;
     }