mac: Fix tab strip outline when dragging out a tab.

chrome/browser/ui/cocoa/tabs/tab_strip_controller.mm

Index: chrome/browser/ui/cocoa/tabs/tab_strip_controller.mm
diff --git a/chrome/browser/ui/cocoa/tabs/tab_strip_controller.mm b/chrome/browser/ui/cocoa/tabs/tab_strip_controller.mm
index e62ccd306e07bb498887ec46b3bf9e44590e5a90..2b12d702887b9defcb621bc53ce364456f77a163 100644
--- a/chrome/browser/ui/cocoa/tabs/tab_strip_controller.mm
+++ b/chrome/browser/ui/cocoa/tabs/tab_strip_controller.mm
@@ -517,7 +517,7 @@ private:
 }
 
 + (CGFloat)defaultTabHeight {
-  return 25.0;
+  return 26.0;
 }
 
 + (CGFloat)defaultLeftIndentForControls {
@@ -970,7 +970,7 @@ private:
 
     BOOL isPlaceholder = [[tab view] isEqual:placeholderTab_];
     NSRect tabFrame = [[tab view] frame];
-    tabFrame.size.height = [[self class] defaultTabHeight] + 1;
+    tabFrame.size.height = [[self class] defaultTabHeight];
     tabFrame.origin.y = 0;
     tabFrame.origin.x = offset;