Removed unused member variable in OpenTypeCapsSupport

Jumbo builds (where the compiler has more information) noticed that
run_ is unused and emitted a warning.

R=drott@chromium.org

Change-Id: I4a975375cfc772e77dd5e9692c5cdc982a8453c1
Reviewed-on: https://chromium-review.googlesource.com/663179
Commit-Queue: Daniel Bratell <bratell@opera.com>
Commit-Queue: Dominik Röttsches <drott@chromium.org>
Reviewed-by: Dominik Röttsches <drott@chromium.org>
Cr-Commit-Position: refs/heads/master@{#501256}

third_party/WebKit/Source/platform/fonts/opentype/OpenTypeCapsSupport.h

@@ -34,7 +34,6 @@ class PLATFORM_EXPORT OpenTypeCapsSupport {
 
   const HarfBuzzFace* harf_buzz_face_;
   FontDescription::FontVariantCaps requested_caps_;
-  SmallCapsIterator::SmallCapsBehavior run_case_;
 
   enum class FontSupport {
     kFull,