Requiring goog breaks reloading with Namespace already declared

[mfikes]

If you require goog, reloading will break with an error indicating

Namespace "my_app.ios.core" already loaded

error message.

Repro:

Set up fresh project using re-natal init FutureApp and go through the steps, establishing an iOS REPL. Then modify the ns form in the source for the future-app.ios.core namespace to add goog to the list of libraries in the :require section. Save the file and then observe red screen with:

Namespace "future_app.ios.core" already declared.

eval
    [native code]:0
<unknown>
    figwheel-bridge.js:116:25
tryCallOne
    core.js:37:14
<unknown>
    core.js:123:25
_callTimer
    JSTimers.js:152:14
_callImmediatesPass
    JSTimers.js:200:17
callImmediates
    JSTimers.js:473:30
callImmediates
    [native code]:0
__callImmediates
    MessageQueue.js:337:6
<unknown>
    MessageQueue.js:135:6
__guard
    MessageQueue.js:314:10
flushedQueue
    MessageQueue.js:134:17
flushedQueue
    [native code]:0
invokeCallbackAndReturnFlushedQueue
    [native code]:0

This is also reproducible with Android.