To ensure that the location bar will not reach the minimum width.

chrome/browser/ui/cocoa/extensions/browser_actions_container_view.h

Index: chrome/browser/ui/cocoa/extensions/browser_actions_container_view.h
diff --git a/chrome/browser/ui/cocoa/extensions/browser_actions_container_view.h b/chrome/browser/ui/cocoa/extensions/browser_actions_container_view.h
index 68ae666f64bb7acff91acab532934d784a45a0d3..895c7c88b4831cd69dcf45c6a1d0c3a6f9463c42 100644
--- a/chrome/browser/ui/cocoa/extensions/browser_actions_container_view.h
+++ b/chrome/browser/ui/cocoa/extensions/browser_actions_container_view.h
@@ -16,6 +16,12 @@ extern NSString* const kBrowserActionGrippyDraggingNotification;
 // Sent when a user-initiated drag to resize the container has finished.
 extern NSString* const kBrowserActionGrippyDragFinishedNotification;
 
+// Sent before the dragging will resize the container.
+extern NSString* const kBrowserActionGrippyWillDragNotification;
+
+// Key which is used to notify the translation with delta.
+extern NSString* const kTranslationWithDelta;
+
 // The view that encompasses the Browser Action buttons in the toolbar and
 // provides mechanisms for resizing.
 @interface BrowserActionsContainerView : NSView {