Mac: Remove some remaining 10.6 logic for absent overlay scrollbar APIs

third_party/WebKit/Source/platform/mac/NSScrollerImpDetails.h

Index: third_party/WebKit/Source/platform/mac/NSScrollerImpDetails.h
diff --git a/third_party/WebKit/Source/platform/mac/NSScrollerImpDetails.h b/third_party/WebKit/Source/platform/mac/NSScrollerImpDetails.h
index e1c863150abe83c4e468281481c2e9e2a288edb8..7096d319a0cc8b2caa5fd965c220cf3daa81e582 100644
--- a/third_party/WebKit/Source/platform/mac/NSScrollerImpDetails.h
+++ b/third_party/WebKit/Source/platform/mac/NSScrollerImpDetails.h
@@ -28,27 +28,6 @@
 
 #import <AvailabilityMacros.h>
 
-// This file forward-declares APIs for NSScroller that are only present on
-// build SDKs newer than are currently supported.
-
-#if !defined(MAC_OS_X_VERSION_10_7) || MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_7
-enum {
-    NSScrollerStyleLegacy       = 0,
-    NSScrollerStyleOverlay      = 1
-};
-typedef NSInteger NSScrollerStyle;
-
-enum {
-    NSScrollerKnobStyleDefault = 0,
-    NSScrollerKnobStyleDark = 1,
-    NSScrollerKnobStyleLight = 2
-};
-typedef NSInteger NSScrollerKnobStyle;
-@interface NSScroller(NSObject)
-+ (NSScrollerStyle)preferredScrollerStyle;
-@end
-#endif // !10.7
-
 @interface NSObject (ScrollbarPainter)
 + (id)scrollerImpWithStyle:(NSScrollerStyle)newScrollerStyle controlSize:(NSControlSize)newControlSize horizontal:(BOOL)horizontal replacingScrollerImp:(id)previous;
 - (CGFloat)knobAlpha;