Delete some unused code found by the clang static analyzer.

chrome/browser/ui/cocoa/browser_window_controller_private.mm

 // Copyright (c) 2011 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/browser_window_controller_private.h"
 
 #include <cmath>
 
 #include "base/command_line.h"
 #import "base/memory/scoped_nsobject.h"
@@ skipping 197 matching lines @@
     [(id)window setShouldHideTitle:![self hasTitleBar]];
 
   BOOL inPresentationMode = [self inPresentationMode];
   CGFloat floatingBarHeight = [self floatingBarHeight];
   // In presentation mode, |yOffset| accounts for the sliding position of the
   // floating bar and the extra offset needed to dodge the menu bar.
   CGFloat yOffset = inPresentationMode ?
       (std::floor((1 - floatingBarShownFraction_) * floatingBarHeight) -
           [presentationModeController_ floatingBarVerticalOffset]) : 0;
   CGFloat maxY = NSMaxY(contentBounds) + yOffset;
-  CGFloat startMaxY = maxY;
 
   CGFloat overlayMaxY =
       NSMaxY([window frame]) +
       std::floor((1 - floatingBarShownFraction_) * floatingBarHeight);
   [self layoutPresentationModeToggleAtOverlayMaxX:NSMaxX([window frame])
                                       overlayMaxY:overlayMaxY];
 
   if ([self hasTabStrip]) {
-    // If we need to lay out the top tab strip, replace |maxY| and |startMaxY|
-    // with higher values, and then lay out the tab strip.
-    NSRect windowFrame = [contentView convertRect:[window frame] fromView:nil];
-    startMaxY = maxY = NSHeight(windowFrame) + yOffset;
+    // If we need to lay out the top tab strip, replace |maxY| with a higher
+    // value, and then lay out the tab strip.
     maxY = [self layoutTabStripAtMaxY:maxY
                                 width:width
                            fullscreen:[self isFullscreen]];
   }
 
   // Sanity-check |maxY|.
   DCHECK_GE(maxY, minY);
   DCHECK_LE(maxY, NSMaxY(contentBounds) + yOffset);
 
   // Place the toolbar at the top of the reserved area.
@@ skipping 649 matching lines @@
 - (void)disableBarVisibilityUpdates {
   // Early escape if there's nothing to do.
   if (!barVisibilityUpdatesEnabled_)
     return;
 
   barVisibilityUpdatesEnabled_ = NO;
   [presentationModeController_ cancelAnimationAndTimers];
 }
 
 @end  // @implementation BrowserWindowController(Private)