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

The tab drawing code had a spurious "+ 1". Move that into the
tab height, so that other places that look at this (such as the
tab drag-out code) get a consistent value.

The new height also matches the height of the corresponding bitmap:
chrome/app/theme/def_100/mac/tab_active_left.png ist 29px high and
has empty pixels at the top.

BUG=52468
TEST=drag out tab. tab in new window looks good.

Review URL: https://codereview.chromium.org/11419302

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@171013 0039d316-1c4b-4281-b951-d872f2087c98

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;