[Mac] Organize all infobar files into chrome/browser/ui/cocoa/infobars/....

chrome/browser/ui/cocoa/infobar_gradient_view_unittest.mm

-// Copyright (c) 2009 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.
-
-#include "base/scoped_nsobject.h"
-#import "chrome/browser/ui/cocoa/infobar_gradient_view.h"
-#import "chrome/browser/ui/cocoa/cocoa_test_helper.h"
-
-namespace {
-
-class InfoBarGradientViewTest : public CocoaTest {
- public:
-  InfoBarGradientViewTest() {
-    NSRect frame = NSMakeRect(0, 0, 100, 30);
-    scoped_nsobject<InfoBarGradientView> view(
-        [[InfoBarGradientView alloc] initWithFrame:frame]);
-    view_ = view.get();
-    [[test_window() contentView] addSubview:view_];
-  }
-
-  InfoBarGradientView* view_;  // Weak. Retained by view hierarchy.
-};
-
-TEST_VIEW(InfoBarGradientViewTest, view_);
-
-// Assert that the view is non-opaque, because otherwise we will end
-// up with findbar painting issues.
-TEST_F(InfoBarGradientViewTest, AssertViewNonOpaque) {
-  EXPECT_FALSE([view_ isOpaque]);
-}
-
-}  // namespace