Fix bug 104170: [Mac OS] Best-fit-window-zoom doesn't work anymore

chrome/browser/ui/cocoa/browser_window_cocoa.mm

Index: chrome/browser/ui/cocoa/browser_window_cocoa.mm
diff --git a/chrome/browser/ui/cocoa/browser_window_cocoa.mm b/chrome/browser/ui/cocoa/browser_window_cocoa.mm
index 3807d7a8595fb40cbebed9fbad4b97e90dfce6bd..3861a6be911b05cb52028c4976dbf7f95cad501c 100644
--- a/chrome/browser/ui/cocoa/browser_window_cocoa.mm
+++ b/chrome/browser/ui/cocoa/browser_window_cocoa.mm
@@ -14,6 +14,7 @@
 #include "chrome/browser/download/download_shelf.h"
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/tab_contents/tab_contents_view_mac.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_list.h"
 #import "chrome/browser/ui/cocoa/browser/avatar_button_controller.h"
@@ -599,6 +600,12 @@ NSWindow* BrowserWindowCocoa::window() const {
   return [controller_ window];
 }
 
+void BrowserWindowCocoa::UpdatePreferredSize(content::WebContents* web_contents,
+                                             const gfx::Size& pref_size) {
+  static_cast<TabContentsViewMac*>(web_contents->GetView())->
+      set_preferred_width(pref_size.width());
+}
+
 void BrowserWindowCocoa::ShowAvatarBubble(WebContents* web_contents,
                                           const gfx::Rect& rect) {
   NSView* view = web_contents->GetNativeView();