Make GLES2DecoderPassthrough::DoReleaseTexImage2DCHROMIUM release images

BUG=788993

Change-Id: I9fc477c0ba27283c5aa2d00400b510705e1929d9
Reviewed-on: https://chromium-review.googlesource.com/792538Reviewed-by: Antoine Labour <piman@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Commit-Queue: Bill Orr <billorr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#519757}

gpu/command_buffer/service/gles2_cmd_decoder_passthrough_doers.cc

@@ -4071,7 +4071,7 @@ error::Error GLES2DecoderPassthroughImpl::DoReleaseTexImage2DCHROMIUM(
   }
 
   // Only release the image if it is currently bound
-  if (bound_texture.texture->GetLevelImage(target, 0) != image) {
+  if (bound_texture.texture->GetLevelImage(target, 0) == image) {
     image->ReleaseTexImage(target);
     bound_texture.texture->SetLevelImage(target, 0, nullptr);
   }