Fix some infobar problems.

chrome/browser/ui/cocoa/browser_window_controller.mm

Index: chrome/browser/ui/cocoa/browser_window_controller.mm
diff --git a/chrome/browser/ui/cocoa/browser_window_controller.mm b/chrome/browser/ui/cocoa/browser_window_controller.mm
index bd550e350d05c759184857c1c34c19cd70d1a987..6316f327c2f7222e162350187b2e7a8052204caf 100644
--- a/chrome/browser/ui/cocoa/browser_window_controller.mm
+++ b/chrome/browser/ui/cocoa/browser_window_controller.mm
@@ -1957,6 +1957,12 @@ using content::WebContents;
   [toolbarController_ setDividerOpacity:[self toolbarDividerOpacity]];
   [self adjustToolbarAndBookmarkBarForCompression:
           [controller getDesiredToolbarHeightCompression]];
+
+  // Stretch the top infobar's arrow if the bookmark has been shown.
+  NSInteger arrowHeight = [infoBarContainerController_ defaultArrowHeight];
+  if (newState == BookmarkBar::SHOW)
+    arrowHeight += controller.view.frame.size.height;
+  [infoBarContainerController_ setMaxTopArrowHeight:arrowHeight];
 }
 
 // (Needed for |BookmarkBarControllerDelegate| protocol.)
@@ -1966,6 +1972,12 @@ willAnimateFromState:(BookmarkBar::State)oldState
   [toolbarController_ setDividerOpacity:[self toolbarDividerOpacity]];
   [self adjustToolbarAndBookmarkBarForCompression:
           [controller getDesiredToolbarHeightCompression]];
+
+  // Shorten the top infobar's arrow if the bookmark is going to be hidden
+  // or detached.
+  NSInteger arrowHeight = [infoBarContainerController_ defaultArrowHeight];
+  if (newState != BookmarkBar::SHOW)
+    [infoBarContainerController_ setMaxTopArrowHeight:arrowHeight];
 }
 
 // (Private/TestingAPI)