Clean up null check for mBackNavigationController
Only need to check when calling startBackNavigation. Bug: 131727607 Test: build/flash Change-Id: Ib6b92a4019070bc711e7a1ea9462eaf2d404df42
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Only need to check when calling startBackNavigation. Bug: 131727607 Test: build/flash Change-Id: Ib6b92a4019070bc711e7a1ea9462eaf2d404df42