Remove a bunch of TOOLKIT_GTK in content/ and gpu/, as well as NPAPI plugins on linux

content/renderer/webscrollbarbehavior_impl_gtkoraura.cc

Index: content/renderer/webscrollbarbehavior_impl_gtkoraura.cc
diff --git a/content/renderer/webscrollbarbehavior_impl_gtkoraura.cc b/content/renderer/webscrollbarbehavior_impl_gtkoraura.cc
index 8398858b5b2e95efe1a5d243c6a426cc1e51f10c..e9d77bb3f50c81192d3d75e843ca5525c3c4fbb5 100644
--- a/content/renderer/webscrollbarbehavior_impl_gtkoraura.cc
+++ b/content/renderer/webscrollbarbehavior_impl_gtkoraura.cc
@@ -13,7 +13,7 @@ bool WebScrollbarBehaviorImpl::shouldCenterOnThumb(
       blink::WebScrollbarBehavior::Button mouseButton,
       bool shiftKeyPressed,
       bool altKeyPressed) {
-#if defined(TOOLKIT_GTK) || (defined(OS_LINUX) && !defined(OS_CHROMEOS))
+#if (defined(OS_LINUX) && !defined(OS_CHROMEOS))
   if (mouseButton == blink::WebScrollbarBehavior::ButtonMiddle)
     return true;
 #endif
@@ -25,10 +25,6 @@ bool WebScrollbarBehaviorImpl::shouldSnapBackToDragOrigin(
     const blink::WebPoint& eventPoint,
     const blink::WebRect& scrollbarRect,
     bool isHorizontal) {
-#if defined(TOOLKIT_GTK)
-  return false;
-#endif
-
   // Constants used to figure the drag rect outside which we should snap the
   // scrollbar thumb back to its origin. These calculations are based on
   // observing the behavior of the MSVC8 main window scrollbar + some
@@ -48,4 +44,4 @@ bool WebScrollbarBehaviorImpl::shouldSnapBackToDragOrigin(
   return !noSnapRect.Contains(eventPoint);
 }
 
-}  // namespace content
+}  // namespace content