Consolidate SDK forwards in sdk_forward_declarations.h.

content/browser/renderer_host/render_widget_host_view_mac.mm

Index: content/browser/renderer_host/render_widget_host_view_mac.mm
diff --git a/content/browser/renderer_host/render_widget_host_view_mac.mm b/content/browser/renderer_host/render_widget_host_view_mac.mm
index 9b149735a781ec92f73e8ae3db9bfbeb1dc367e7..9ee7e5e0337d4a1032bd8adb006bbda83fb594b3 100644
--- a/content/browser/renderer_host/render_widget_host_view_mac.mm
+++ b/content/browser/renderer_host/render_widget_host_view_mac.mm
@@ -104,29 +104,12 @@ using blink::WebGestureEvent;
 // Declare things that are part of the 10.7 SDK.
 #if !defined(MAC_OS_X_VERSION_10_7) || \
     MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_7
-@interface NSView (NSOpenGLSurfaceResolutionLionAPI)
-- (void)setWantsBestResolutionOpenGLSurface:(BOOL)flag;
-@end
 
 static NSString* const NSWindowDidChangeBackingPropertiesNotification =
     @"NSWindowDidChangeBackingPropertiesNotification";
 
 #endif  // 10.7
 
-// Declare things that are part of the 10.9 SDK.
-#if !defined(MAC_OS_X_VERSION_10_9) || \
-    MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_9
-enum {
-   NSWindowOcclusionStateVisible = 1UL << 1,
-};
-typedef NSUInteger NSWindowOcclusionState;
-
-@interface NSWindow (MavericksAPI)
-- (NSWindowOcclusionState)occlusionState;
-@end
-
-#endif  // 10.9
-
 // This method will return YES for OS X versions 10.7.3 and later, and NO
 // otherwise.
 // Used to prevent a crash when building with the 10.7 SDK and accessing the