[rAC, OSX] labels should not draw background.

chrome/browser/ui/cocoa/autofill/autofill_section_container.mm

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "chrome/browser/ui/cocoa/autofill/autofill_section_container.h"
 
 #include <algorithm>
 
 #include "base/mac/foundation_util.h"
 #include "base/strings/sys_string_conversions.h"
@@ skipping 448 matching lines @@
 }
 
 - (NSTextField*)makeDetailSectionLabel:(NSString*)labelText {
   base::scoped_nsobject<NSTextField> label([[NSTextField alloc] init]);
   [label setFont:
       [[NSFontManager sharedFontManager] convertFont:[label font]
                                          toHaveTrait:NSBoldFontMask]];
   [label setStringValue:labelText];
   [label setEditable:NO];
   [label setBordered:NO];
+  [label setDrawsBackground:NO];
   [label sizeToFit];
   return label.autorelease();
 }
 
 - (void)updateAndClobber:(BOOL)shouldClobber {
   const autofill::DetailInputs& updatedInputs =
       delegate_->RequestedFieldsForSection(section_);
 
   for (autofill::DetailInputs::const_iterator iter = updatedInputs.begin();
        iter != updatedInputs.end();
@@ skipping 142 matching lines @@
 
 - (void)activateFieldForInput:(const autofill::DetailInput&)input {
   if ([self detailInputForType:input.type] != &input)
     return;
 
   NSControl<AutofillInputField>* field = [inputs_ viewWithTag:input.type];
   [[field window] makeFirstResponder:field];
 }
 
 @end