[Mac] Tracking-area hygiene.

When tracking areas have an owner different from the view they are
added to, they can exist past the owner's death.  These have not been
implicated in any crashes, but it's the best idea I have for the bug.

BUG=38441
TEST=none

Review URL: http://codereview.chromium.org/2823013

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@50387 0039d316-1c4b-4281-b951-d872f2087c98

4 files changed, 22 insertions, 0 deletions

diff --git a/chrome/browser/cocoa/chrome_browser_window.mm b/chrome/browser/cocoa/chrome_browser_window.mm
index eecf09f..35aae1a 100644
--- a/chrome/browser/cocoa/chrome_browser_window.mm
+++ b/chrome/browser/cocoa/chrome_browser_window.mm
@@ -58,6 +58,10 @@ namespace {
 - (void)dealloc {
   [[NSNotificationCenter defaultCenter] removeObserver:self];
   [[NSDistributedNotificationCenter defaultCenter] removeObserver:self];
+  if (widgetTrackingArea_) {
+    [[self frameView] removeTrackingArea:widgetTrackingArea_];
+    widgetTrackingArea_.reset();
+  }
   [super dealloc];
 }
 
diff --git a/chrome/browser/cocoa/download_item_cell.mm b/chrome/browser/cocoa/download_item_cell.mm
index 84d4421..6e14a27 100644
--- a/chrome/browser/cocoa/download_item_cell.mm
+++ b/chrome/browser/cocoa/download_item_cell.mm
@@ -219,6 +219,14 @@ NSGradient* BackgroundTheme::GetNSGradient(int id) const {
     [completionAnimation_ stopAnimation];
   if ([hideStatusAnimation_ isAnimating])
     [hideStatusAnimation_ stopAnimation];
+  if (trackingAreaButton_) {
+    [[self controlView] removeTrackingArea:trackingAreaButton_];
+    trackingAreaButton_.reset();
+  }
+  if (trackingAreaDropdown_) {
+    [[self controlView] removeTrackingArea:trackingAreaDropdown_];
+    trackingAreaDropdown_.reset();
+  }
   [secondaryTitle_ release];
   [secondaryFont_ release];
   [super dealloc];
diff --git a/chrome/browser/cocoa/fullscreen_controller.mm b/chrome/browser/cocoa/fullscreen_controller.mm
index 74de909..1b463d0 100644
--- a/chrome/browser/cocoa/fullscreen_controller.mm
+++ b/chrome/browser/cocoa/fullscreen_controller.mm
@@ -169,6 +169,7 @@ const CGFloat kFloatingBarVerticalOffset = 22;
 
 - (void)dealloc {
   DCHECK(!isFullscreen_);
+  DCHECK(!trackingArea_);
   [super dealloc];
 }
 
diff --git a/chrome/browser/cocoa/gradient_button_cell.mm b/chrome/browser/cocoa/gradient_button_cell.mm
index 15110e8..523b4d7 100644
--- a/chrome/browser/cocoa/gradient_button_cell.mm
+++ b/chrome/browser/cocoa/gradient_button_cell.mm
@@ -88,6 +88,14 @@ static const NSTimeInterval kAnimationHideDuration = 0.4;
   return self;
 }
 
+- (void)dealloc {
+  if (trackingArea_) {
+    [[self controlView] removeTrackingArea:trackingArea_];
+    trackingArea_.reset();
+  }
+  [super dealloc];
+}
+
 - (NSGradient*)gradientForHoverAlpha:(CGFloat)hoverAlpha
                             isThemed:(BOOL)themed {
   CGFloat startAlpha = 0.6 + 0.3 * hoverAlpha;
@@ -146,6 +154,7 @@ static const NSTimeInterval kAnimationHideDuration = 0.4;
   if (showOnly) {
     if (trackingArea_.get()) {
       [self setShowsBorderOnlyWhileMouseInside:NO];
+      [[self controlView] removeTrackingArea:trackingArea_];
     }
     trackingArea_.reset([[NSTrackingArea alloc]
                           initWithRect:[[self controlView]