Fix the candidate window position of IME in Retina display.

content/browser/renderer_host/render_widget_host_view_mac.mm

 // Copyright (c) 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.
 
 #include "content/browser/renderer_host/render_widget_host_view_mac.h"
 
 #include <QuartzCore/QuartzCore.h>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 2794 matching lines @@
 
     // TODO(thakis): Pipe |actualRange| through TextInputClientMac machinery.
     if (actualRange)
       *actualRange = theRange;
   }
 
   // The returned rectangle is in WebKit coordinates (upper left origin), so
   // flip the coordinate system and then convert it into screen coordinates for
   // return.
   NSRect viewFrame = [self frame];
-  rect.origin.y = NSHeight(viewFrame) - rect.origin.y;
-  rect.origin.y -= rect.size.height;
-  rect = [self convertRectToBase:rect];
+  rect.origin.y = NSHeight(viewFrame) - NSMaxY(rect);
+  rect = [self convertRect:rect toView:nil];
   rect.origin = [[self window] convertBaseToScreen:rect.origin];
   return rect;
 }
 
 - (NSRange)markedRange {
   // An input method calls this method to check if an application really has
   // a text being composed when hasMarkedText call returns true.
   // Returns the range saved in the setMarkedText method so the input method
   // calls the setMarkedText method and we can update the composition node
   // there. (When this method returns an empty range, the input method doesn't
@@ skipping 384 matching lines @@
   if (!string) return NO;
 
   // If the user is currently using an IME, confirm the IME input,
   // and then insert the text from the service, the same as TextEdit and Safari.
   [self confirmComposition];
   [self insertText:string];
   return YES;
 }
 
 @end