add process.browser conditional branch

[kota-yata]

34

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[kota-yata]

@googlebot I signed it!

[tomayac]

Thanks for opening this PR. However, since process.browser throws Uncaught ReferenceError: process is not defined, I fear this won't work in the general non-NuxtJS case. On top, it seems this has been deprecated and replaced with process.client.