Don't draw a window title on browser windows.

chrome/browser/ui/cocoa/framed_browser_window.mm

Index: chrome/browser/ui/cocoa/framed_browser_window.mm
diff --git a/chrome/browser/ui/cocoa/framed_browser_window.mm b/chrome/browser/ui/cocoa/framed_browser_window.mm
index 0989b6a543f296e73e36b5b2484fd6ef7cd14ef1..b916e46ffce7b3cf3d1f926d35885b68fe177a4a 100644
--- a/chrome/browser/ui/cocoa/framed_browser_window.mm
+++ b/chrome/browser/ui/cocoa/framed_browser_window.mm
@@ -36,7 +36,7 @@ const CGFloat kWindowGradientHeight = 24.0;
 
 }
 
-@interface FramedBrowserWindow (Private)
+@interface FramedBrowserWindow ()
 
 - (void)adjustCloseButton:(NSNotification*)notification;
 - (void)adjustMiniaturizeButton:(NSNotification*)notification;
@@ -252,11 +252,18 @@ const CGFloat kWindowGradientHeight = 24.0;
 }
 
 - (void)setShouldHideTitle:(BOOL)flag {
-  shouldHideTitle_ = flag;
+  if ([self respondsToSelector:@selector(setTitleVisibility:)])
+    self.titleVisibility = flag ? NSWindowTitleHidden : NSWindowTitleVisible;
+  else
+    shouldHideTitle_ = flag;
 }
 
 - (BOOL)_isTitleHidden {
-  return shouldHideTitle_;
+  // Only intervene with 10.6-10.9.
+  if ([self respondsToSelector:@selector(setTitleVisibility:)])
+    return [super _isTitleHidden];
+  else
+    return shouldHideTitle_;
 }
 
 - (CGFloat)windowButtonsInterButtonSpacing {
@@ -349,9 +356,12 @@ const CGFloat kWindowGradientHeight = 24.0;
                           bounds:windowRect
             forceBlackBackground:NO];
 
-  // If the window needs a title and we painted over the title as drawn by the
-  // default window paint, paint it ourselves.
-  if (themed && [view respondsToSelector:@selector(_titlebarTitleRect)] &&
+  // In Yosemite: The title is drawn by a subview and not painted on. Therefore,
+  // never worry about drawing it. Pre-Yosemite: If the window needs a title and
+  // we painted over the title as drawn by the default window paint, paint it
+  // ourselves.
+  if (![self respondsToSelector:@selector(setTitleVisibility:)] &&
+      themed && [view respondsToSelector:@selector(_titlebarTitleRect)] &&
       [view respondsToSelector:@selector(_drawTitleStringIn:withColor:)] &&
       ![self _isTitleHidden]) {
     [view _drawTitleStringIn:[view _titlebarTitleRect]