We've got some code that's specifically made to gather Flash plugin process crashes. Namely breakpad's injector [1][2] which we use to inject our exception handler in Flass processes and all the code that relies on it and is guarded by MOZ_CRASH_INJECTOR [3].

Once the injector is removed we can also assume that the annotations of a crashed child process are always populated and remove [4].

Quick note: I have to update the description here because it's not accurate anymore. Some parts of the injector are still needed (e.g. for SpiderMonkey) while there's bits of IPC that must go.