Now content sandbox process is enabled. Since uim-mozc uses vfork, it causes sandbox violation. It is unnecessary to load IM module on content process becasue we don't use GTK IM APIs on content process.
MozReview-Commit-ID: GrPlmazzEMd
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extra : rebase_source : e12ec563807627a7fb84b2ca56eaa552aac22643