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The AppListView observes the SpeechUIModel directly, so SpeechUIModel
must outlive profile changes within Chrome's AppListViewDelegate.
Profile changes only recreate the app_list::ContentView and subviews,
which updates app_list::AppListModel observers, but not
app_list::SpeechUIModel observers.

This comes up when switching profiles in the desktop app list.

To fix, this change gives SpeechUIModel a default constructor to
simplify setting the initial speech recognition state, which needs the
profile. Then, decouples the lifetime of the SpeechUIModel from the
Profile in Chrome's AppListViewDelegate.

BUG=405827
TBR=jamescook@chromium.org

Review URL: https://codereview.chromium.org/550883002

Cr-Commit-Position: refs/heads/master@{#293878}