Delete even more unused views code

Bug: skia:
Change-Id: I41480aa89dfcd8cb7e016e477cbabe354f35ce8a
Reviewed-on: https://skia-review.googlesource.com/75480
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
diff --git a/tools/viewer/SampleSlide.cpp b/tools/viewer/SampleSlide.cpp
index 45cdc93..7c6fe11 100644
--- a/tools/viewer/SampleSlide.cpp
+++ b/tools/viewer/SampleSlide.cpp
@@ -9,6 +9,7 @@
 
 #include "SkCanvas.h"
 #include "SkCommonFlags.h"
+#include "SkKey.h"
 #include "SkOSFile.h"
 #include "SkStream.h"