Mac: Fix rounded corners on browser windows on retina display.

chrome/browser/ui/cocoa/browser_window_controller_private.h

Index: chrome/browser/ui/cocoa/browser_window_controller_private.h
diff --git a/chrome/browser/ui/cocoa/browser_window_controller_private.h b/chrome/browser/ui/cocoa/browser_window_controller_private.h
index e5de062a9c094a177ba07c5594109fd806b117e3..92bb80dedd23289a8e999d762f8af774926d972b 100644
--- a/chrome/browser/ui/cocoa/browser_window_controller_private.h
+++ b/chrome/browser/ui/cocoa/browser_window_controller_private.h
@@ -91,6 +91,9 @@
 // sends a message to the renderer to resize.
 - (void)layoutTabContentArea:(NSRect)frame;
 
+// Updates whether the bottom two corners are rounded.
+- (void)updateRoundedBottomCorners;
+
 // Sets the toolbar's height to a value appropriate for the given compression.
 // Also adjusts the bookmark bar's height by the opposite amount in order to
 // keep the total height of the two views constant.