Revert "Force tabs to be integer widths."

chrome/browser/ui/cocoa/tabs/tab_strip_controller.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/tabs/tab_strip_controller.h"
 
 #import <QuartzCore/QuartzCore.h>
 
-#include <cmath>
 #include <limits>
 #include <string>
 
 #include "base/command_line.h"
 #include "base/mac/mac_util.h"
 #include "base/sys_string_conversions.h"
 #include "chrome/app/chrome_command_ids.h"
 #include "chrome/browser/autocomplete/autocomplete.h"
 #include "chrome/browser/autocomplete/autocomplete_classifier.h"
 #include "chrome/browser/autocomplete/autocomplete_match.h"
@@ skipping 832 matching lines @@
   // Initialize |nonMiniTabWidth| in case there aren't any non-mini-tabs; this
   // value shouldn't actually be used.
   CGFloat nonMiniTabWidth = kMaxTabWidth;
   const NSInteger numberOfOpenNonMiniTabs = [self numberOfOpenNonMiniTabs];
   if (numberOfOpenNonMiniTabs) {
     // Find the width of a non-mini-tab. This only applies to horizontal
     // mode. Add in the amount we "get back" from the tabs overlapping.
     availableSpaceForNonMini += (numberOfOpenNonMiniTabs - 1) * kTabOverlap;
 
     // Divide up the space between the non-mini-tabs.
-    nonMiniTabWidth =
-        std::floor(availableSpaceForNonMini / numberOfOpenNonMiniTabs);
+    nonMiniTabWidth = availableSpaceForNonMini / numberOfOpenNonMiniTabs;
 
     // Clamp the width between the max and min.
     nonMiniTabWidth = MAX(MIN(nonMiniTabWidth, kMaxTabWidth), kMinTabWidth);
   }
 
   BOOL visible = [[tabStripView_ window] isVisible];
 
   CGFloat offset = [self leftIndentForControls];
   bool hasPlaceholderGap = false;
   // Whether or not the last tab processed by the loop was a mini tab.
@@ skipping 1145 matching lines @@
   NSInteger index = [self indexFromModelIndex:modelIndex];
   BrowserWindowController* controller =
       (BrowserWindowController*)[[switchView_ window] windowController];
   DCHECK(index >= 0);
   if (index >= 0) {
     [controller setTab:[self viewAtIndex:index] isDraggable:YES];
   }
 }
 
 @end