Don't reset the layout on RenderText display rect width change.

ui/gfx/render_text.cc

 // 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 "ui/gfx/render_text.h"
 
 #include <algorithm>
 
 #include "base/i18n/break_iterator.h"
 #include "base/logging.h"
@@ skipping 427 matching lines @@
 
 void RenderText::SetObscured(bool obscured) {
   if (obscured != obscured_) {
     obscured_ = obscured;
     cached_bounds_and_offset_valid_ = false;
     ResetLayout();
   }
 }
 
 void RenderText::SetDisplayRect(const Rect& r) {
-  if (r.width() != display_rect_.width())
-    ResetLayout();
   display_rect_ = r;
   cached_bounds_and_offset_valid_ = false;
 }
 
 void RenderText::SetCursorPosition(size_t position) {
   MoveCursorTo(position, false);
 }
 
 void RenderText::MoveCursor(BreakType break_type,
                             VisualCursorDirection direction,
@@ skipping 549 matching lines @@
   if (cursor_enabled() && cursor_visible() && focused()) {
     const Rect& bounds = GetUpdatedCursorBounds();
     if (bounds.width() != 0)
       canvas->FillRect(bounds, cursor_color_);
     else
       canvas->DrawRect(bounds, cursor_color_);
   }
 }
 
 }  // namespace gfx