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An important thing is that [NativeWidget A] owns Win32 input focus even
when [View X] is logically focused by FocusManager. As a result, an Win32
IME may want to interact with the native view of [NativeWidget A] rather
than that of [NativeWidget B]. This is why we need to call
GetTopLevelWidget() here.

Previous implementation treated [NativeWidget B] as associated with
the IME but it was wrong. This CL fixes the this confusion.

BUG=246534

Review URL: https://chromiumcodereview.appspot.com/17101019

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@208018 0039d316-1c4b-4281-b951-d872f2087c98