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After the CL: https://codereview.chromium.org/2235283003 which implemented composition
range information tracking on the browser side for Mac, the method TIM::GetCompositionRangeInfo
was changed to take the RenderWidgetHostView for which the information is required. However,
the view pointer is not actually used and the method returns the stored information for |active_view_|
instead.

BUG=NONE

Review-Url: https://codereview.chromium.org/2814443003
Cr-Commit-Position: refs/heads/master@{#463391}