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This CL is making the TtsPlatformImpl instance a leaky
instance since the singleton is alive for the whole
duration of the process.

The use of WeakPtr is no longer required.

Bug: 1133813
Change-Id: I311e8bd354523be7cbdb07d0e87876141ec5e81d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2441967Reviewed-by: François Doray <fdoray@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Commit-Queue: Etienne Bergeron <etienneb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813301}