MacViews: Fix sending mouse exit event and releasing capture on D&D.

ui/base/cocoa/base_view.mm

 // Copyright (c) 2011 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 "ui/base/cocoa/base_view.h"
 
 #include "base/mac/mac_util.h"
 
 NSString* kViewDidBecomeFirstResponder =
     @"Chromium.kViewDidBecomeFirstResponder";
@@ skipping 65 matching lines @@
   // Derived classes should return kEventHandled if they handled an event,
   // otherwise it will be forwarded on to |super|.
   return kEventNotHandled;
 }
 
 - (void)forceTouchEvent:(NSEvent*)theEvent {
   // This method left intentionally blank.
 }
 
 - (void)mouseDown:(NSEvent*)theEvent {
-  dragging_ = YES;
   [self mouseEvent:theEvent];
 }
 
 - (void)rightMouseDown:(NSEvent*)theEvent {
   [self mouseEvent:theEvent];
 }
 
 - (void)otherMouseDown:(NSEvent*)theEvent {
   [self mouseEvent:theEvent];
 }
 
 - (void)mouseUp:(NSEvent*)theEvent {
   [self mouseEvent:theEvent];
-
-  dragging_ = NO;
-  if (pendingExitEvent_.get()) {
-    NSEvent* exitEvent =
-        [NSEvent enterExitEventWithType:NSMouseExited
-                               location:[theEvent locationInWindow]
-                          modifierFlags:[theEvent modifierFlags]
-                              timestamp:[theEvent timestamp]
-                           windowNumber:[theEvent windowNumber]
-                                context:[theEvent context]
-                            eventNumber:[pendingExitEvent_.get() eventNumber]
-                         trackingNumber:[pendingExitEvent_.get() trackingNumber]
-                               userData:[pendingExitEvent_.get() userData]];
-    [self mouseEvent:exitEvent];
-    pendingExitEvent_.reset();
-  }
 }
 
 - (void)rightMouseUp:(NSEvent*)theEvent {
   [self mouseEvent:theEvent];
 }
 
 - (void)otherMouseUp:(NSEvent*)theEvent {
   [self mouseEvent:theEvent];
 }
 
 - (void)mouseMoved:(NSEvent*)theEvent {
   [self mouseEvent:theEvent];
 }
 
 - (void)mouseDragged:(NSEvent*)theEvent {
   [self mouseEvent:theEvent];
 }
 
 - (void)rightMouseDragged:(NSEvent*)theEvent {
   [self mouseEvent:theEvent];
 }
 
 - (void)otherMouseDragged:(NSEvent*)theEvent {
   [self mouseEvent:theEvent];
 }
 
 - (void)mouseEntered:(NSEvent*)theEvent {
-  if (pendingExitEvent_.get()) {
-    pendingExitEvent_.reset();
-    return;
-  }
-
   [self mouseEvent:theEvent];
 }
 
 - (void)mouseExited:(NSEvent*)theEvent {
-  // The tracking area will send an exit event even during a drag, which isn't
-  // how the event flow for drags should work. This stores the exit event, and
-  // sends it when the drag completes instead.
-  if (dragging_) {
-    pendingExitEvent_.reset([theEvent retain]);
-    return;
-  }
-
   [self mouseEvent:theEvent];
 }
 
 - (void)keyDown:(NSEvent*)theEvent {
   if ([self keyEvent:theEvent] != kEventHandled)
     [super keyDown:theEvent];
 }
 
 - (void)keyUp:(NSEvent*)theEvent {
   if ([self keyEvent:theEvent] != kEventHandled)
@@ skipping 24 matching lines @@
   return new_rect;
 }
 
 - (NSRect)flipRectToNSRect:(gfx::Rect)rect {
   NSRect new_rect(NSRectFromCGRect(rect.ToCGRect()));
   new_rect.origin.y = NSHeight([self bounds]) - NSMaxY(new_rect);
   return new_rect;
 }
 
 @end