mac: Remove IsOSLion().

content/browser/renderer_host/render_widget_host_view_mac.mm

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/renderer_host/render_widget_host_view_mac.h"
 
 #import <objc/runtime.h>
 #include <OpenGL/gl.h>
 #include <QuartzCore/QuartzCore.h>
 #include <stdint.h>
@@ skipping 128 matching lines @@
 
 }  // namespace
 
 // These are not documented, so use only after checking -respondsToSelector:.
 @interface NSApplication (UndocumentedSpeechMethods)
 - (void)speakString:(NSString*)string;
 - (void)stopSpeaking:(id)sender;
 - (BOOL)isSpeaking;
 @end
 
-// 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
-// notification below. See: http://crbug.com/260595.
-static BOOL SupportsBackingPropertiesChangedNotification() {
-  // windowDidChangeBackingProperties: method has been added to the
-  // NSWindowDelegate protocol in 10.7.3, at the same time as the
-  // NSWindowDidChangeBackingPropertiesNotification notification was added.
-  // If the protocol contains this method description, the notification should
-  // be supported as well.
-  Protocol* windowDelegateProtocol = NSProtocolFromString(@"NSWindowDelegate");
-  struct objc_method_description methodDescription =
-      protocol_getMethodDescription(
-          windowDelegateProtocol,
-          @selector(windowDidChangeBackingProperties:),
-          NO,
-          YES);
-
-  // If the protocol does not contain the method, the returned method
-  // description is {NULL, NULL}
-  return methodDescription.name != NULL || methodDescription.types != NULL;
-}
-
 // Private methods:
 @interface RenderWidgetHostViewCocoa ()
 @property(nonatomic, assign) NSRange selectedRange;
 @property(nonatomic, assign) NSRange markedRange;
 
 + (BOOL)shouldAutohideCursorForEvent:(NSEvent*)event;
 - (id)initWithRenderWidgetHostViewMac:(RenderWidgetHostViewMac*)r;
 - (void)processedWheelEvent:(const blink::WebMouseWheelEvent&)event
                    consumed:(BOOL)consumed;
 - (void)processedGestureScrollEvent:(const blink::WebGestureEvent&)event
@@ skipping 2162 matching lines @@
   if ([RenderWidgetHostViewCocoa shouldAutohideCursorForEvent:theEvent])
     [NSCursor setHiddenUntilMouseMoves:YES];
 }
 
 - (void)forceTouchEvent:(NSEvent*)theEvent {
   if (ui::ForceClickInvokesQuickLook())
     [self quickLookWithEvent:theEvent];
 }
 
 - (void)shortCircuitScrollWheelEvent:(NSEvent*)event {
-  DCHECK(base::mac::IsOSLionOrLater());
-
   if ([event phase] != NSEventPhaseEnded &&
       [event phase] != NSEventPhaseCancelled) {
     return;
   }
 
   if (renderWidgetHostView_->render_widget_host_) {
     // History-swiping is not possible if the logic reaches this point.
     // Allow rubber-banding in both directions.
     bool canRubberbandLeft = true;
     bool canRubberbandRight = true;
@@ skipping 145 matching lines @@
       [responderDelegate_ respondsToSelector:@selector(handleEvent:)]) {
     BOOL handled = [responderDelegate_ handleEvent:event];
     if (handled)
       return;
   }
 
   // Use an NSEvent monitor to listen for the wheel-end end. This ensures that
   // the event is received even when the mouse cursor is no longer over the view
   // when the scrolling ends (e.g. if the tab was switched). This is necessary
   // for ending rubber-banding in such cases.
-  if (base::mac::IsOSLionOrLater() && [event phase] == NSEventPhaseBegan &&
-      !endWheelMonitor_) {
+  if ([event phase] == NSEventPhaseBegan && !endWheelMonitor_) {
     endWheelMonitor_ =
       [NSEvent addLocalMonitorForEventsMatchingMask:NSScrollWheelMask
       handler:^(NSEvent* blockEvent) {
           [self shortCircuitScrollWheelEvent:blockEvent];
           return blockEvent;
       }];
   }
 
   // This is responsible for content scrolling!
   if (renderWidgetHostView_->render_widget_host_) {
@@ skipping 42 matching lines @@
   updateEvent.data.pinchUpdate.zoomDisabled = !pinchHasReachedZoomThreshold_;
   renderWidgetHostView_->render_widget_host_->ForwardGestureEvent(updateEvent);
 }
 
 - (void)viewWillMoveToWindow:(NSWindow*)newWindow {
   NSWindow* oldWindow = [self window];
 
   NSNotificationCenter* notificationCenter =
       [NSNotificationCenter defaultCenter];
 
-  // Backing property notifications crash on 10.6 when building with the 10.7
-  // SDK, see http://crbug.com/260595.
-  static BOOL supportsBackingPropertiesNotification =
-      SupportsBackingPropertiesChangedNotification();
-
   if (oldWindow) {
-    if (supportsBackingPropertiesNotification) {
-      [notificationCenter
-          removeObserver:self
-                    name:NSWindowDidChangeBackingPropertiesNotification
-                  object:oldWindow];
-    }
+    [notificationCenter
+        removeObserver:self
+                  name:NSWindowDidChangeBackingPropertiesNotification
+                object:oldWindow];
     [notificationCenter
         removeObserver:self
                   name:NSWindowDidMoveNotification
                 object:oldWindow];
     [notificationCenter
         removeObserver:self
                   name:NSWindowDidEndLiveResizeNotification
                 object:oldWindow];
     [notificationCenter
         removeObserver:self
                   name:NSWindowDidBecomeKeyNotification
                 object:oldWindow];
     [notificationCenter
         removeObserver:self
                   name:NSWindowDidResignKeyNotification
                 object:oldWindow];
   }
   if (newWindow) {
-    if (supportsBackingPropertiesNotification) {
-      [notificationCenter
-          addObserver:self
-             selector:@selector(windowDidChangeBackingProperties:)
-                 name:NSWindowDidChangeBackingPropertiesNotification
-               object:newWindow];
-    }
+    [notificationCenter
+        addObserver:self
+           selector:@selector(windowDidChangeBackingProperties:)
+               name:NSWindowDidChangeBackingPropertiesNotification
+             object:newWindow];
     [notificationCenter
         addObserver:self
            selector:@selector(windowChangedGlobalFrame:)
                name:NSWindowDidMoveNotification
              object:newWindow];
     [notificationCenter
         addObserver:self
            selector:@selector(windowChangedGlobalFrame:)
                name:NSWindowDidEndLiveResizeNotification
              object:newWindow];
@@ skipping 807 matching lines @@
 
 // "-webkit-app-region: drag | no-drag" is implemented on Mac by excluding
 // regions that are not draggable. (See ControlRegionView in
 // native_app_window_cocoa.mm). This requires the render host view to be
 // draggable by default.
 - (BOOL)mouseDownCanMoveWindow {
   return YES;
 }
 
 @end