[Home] Fix bottom nav crash initializing menu color.

Removes a needless call to setMenuBackgroundColor that relied on the tab
model selector being initialized, causing an NPE if that wasn't the
case. We already call setMenuBackgroundColor in updateVisuals, which is
called at the appropriate times.

Bug: 779472
Change-Id: Id87722088da11e178b92c4495eb0113faf454418
Reviewed-on: https://chromium-review.googlesource.com/744322Reviewed-by: Matthew Jones <mdjones@chromium.org>
Commit-Queue: Troy Hildebrandt <thildebr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#512696}

chrome/android/java/src/org/chromium/chrome/browser/widget/bottomsheet/BottomSheetContentController.java

@@ -352,8 +352,6 @@ public class BottomSheetContentController
         ViewGroup snackbarContainer =
                 (ViewGroup) mActivity.findViewById(R.id.bottom_sheet_snackbar_container);
         ((MarginLayoutParams) snackbarContainer.getLayoutParams()).bottomMargin = mBottomNavHeight;
-
-        setMenuBackgroundColor(mTabModelSelector.isIncognitoSelected());
     }
 
     /**