MacViews: Fix setMarkedText in BridgedContentView to take replacementRange into account.

ui/views/cocoa/bridged_content_view.mm

 // Copyright 2014 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 "ui/views/cocoa/bridged_content_view.h"
 
 #include "base/logging.h"
 #import "base/mac/mac_util.h"
 #import "base/mac/scoped_nsobject.h"
 #include "base/strings/sys_string_conversions.h"
@@ skipping 1196 matching lines @@
 }
 
 - (void)setMarkedText:(id)text
         selectedRange:(NSRange)selectedRange
      replacementRange:(NSRange)replacementRange {
   if (!textInputClient_)
     return;
 
   if ([text isKindOfClass:[NSAttributedString class]])
     text = [text string];
+
+  textInputClient_->DeleteRange(gfx::Range(replacementRange));
   ui::CompositionText composition;
   composition.text = base::SysNSStringToUTF16(text);
   composition.selection = gfx::Range(selectedRange);
   textInputClient_->SetCompositionText(composition);
 }
 
 - (void)unmarkText {
   if (textInputClient_)
     textInputClient_->ConfirmCompositionText();
 }
@@ skipping 54 matching lines @@
   }
 
   return [super accessibilityAttributeValue:attribute];
 }
 
 - (id)accessibilityHitTest:(NSPoint)point {
   return [hostedView_->GetNativeViewAccessible() accessibilityHitTest:point];
 }
 
 @end