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

chrome/browser/ui/cocoa/extensions/browser_actions_controller.mm

Index: chrome/browser/ui/cocoa/extensions/browser_actions_controller.mm
diff --git a/chrome/browser/ui/cocoa/extensions/browser_actions_controller.mm b/chrome/browser/ui/cocoa/extensions/browser_actions_controller.mm
index 4163045b751496707c25d7124ec8071214c72056..5a12e441890d1fa281884bc339b7b8db5cb12ee5 100644
--- a/chrome/browser/ui/cocoa/extensions/browser_actions_controller.mm
+++ b/chrome/browser/ui/cocoa/extensions/browser_actions_controller.mm
@@ -119,6 +119,10 @@ const CGFloat kBrowserActionBubbleYOffset = 3.0;
 // toolbar know that the drag has finished.
 - (void)containerDragFinished:(NSNotification*)notification;
 
+// Sends a notification for the toolbar to determine whether the container can
+// translate with a delta on x-axis.
+- (void)containerWillTranslateOnX:(NSNotification*)notification;
+
 // Adjusts the position of the surrounding action buttons depending on where the
 // button is within the container.
 - (void)actionButtonDragging:(NSNotification*)notification;
@@ -314,6 +318,11 @@ class ExtensionServiceObserverBridge
            selector:@selector(containerDragFinished:)
                name:kBrowserActionGrippyDragFinishedNotification
              object:containerView_];
+    [[NSNotificationCenter defaultCenter]
+        addObserver:self
+           selector:@selector(containerWillTranslateOnX:)
+               name:kBrowseActionContainerWillTranslateOnXNotification
+             object:containerView_];
     // Listen for a finished drag from any button to make sure each open window
     // stays in sync.
     [[NSNotificationCenter defaultCenter]
@@ -677,6 +686,13 @@ class ExtensionServiceObserverBridge
                     object:self];
 }
 
+- (void)containerWillTranslateOnX:(NSNotification*)notification {
+  [[NSNotificationCenter defaultCenter]
+      postNotificationName:kBrowseActionContainerWillTranslateOnXNotification
+                    object:self
+                  userInfo:notification.userInfo];
+}
+
 - (void)actionButtonDragging:(NSNotification*)notification {
   if (![self chevronIsHidden])
     [self setChevronHidden:YES inFrame:[containerView_ frame] animate:YES];