Fix incorrect window size on session restore.

chrome/browser/ui/cocoa/browser_window_controller.mm

 // Copyright 2012 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.h"
 
 #include <cmath>
 #include <numeric>
 
 #include "base/command_line.h"
@@ skipping 588 matching lines @@
   }
 
   // the tab strip is empty, it's ok to close the window
   return YES;
 }
 
 // Called right after our window became the main window.
 - (void)windowDidBecomeMain:(NSNotification*)notification {
   if (chrome::GetLastActiveBrowser() != browser_) {
     BrowserList::SetLastActive(browser_.get());
-    [self saveWindowPositionIfNeeded];
   }
+  // Always saveWindowPositionIfNeeded when becoming main, not just
+  // when |browser_| is not the last active browser. See crbug.com/536280 .
+  [self saveWindowPositionIfNeeded];
 
   NSView* rootView = [[[self window] contentView] superview];
   [rootView cr_recursivelyInvokeBlock:^(id view) {
       if ([view conformsToProtocol:@protocol(ThemedWindowDrawing)])
         [view windowDidChangeActive];
   }];
 
   extensions::ExtensionCommandsGlobalRegistry::Get(browser_->profile())
       ->set_registry_for_active_window(extension_keybinding_registry_.get());
 }
@@ skipping 1440 matching lines @@
 
 - (BOOL)supportsBookmarkBar {
   return [self supportsWindowFeature:Browser::FEATURE_BOOKMARKBAR];
 }
 
 - (BOOL)isTabbedWindow {
   return browser_->is_type_tabbed();
 }
 
 @end  // @implementation BrowserWindowController(WindowType)