Remove PinnedContentsInfoBubble which doesn't look like it is used.

chrome/browser/ui/views/pinned_contents_info_bubble.cc

-// 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.
-
-#include "chrome/browser/ui/views/pinned_contents_info_bubble.h"
-
-#include "views/bubble/bubble_border.h"
-
-void PinnedContentsBorderContents::SizeAndGetBounds(
-    const gfx::Rect& position_relative_to,
-    views::BubbleBorder::ArrowLocation arrow_location,
-    bool allow_bubble_offscreen,
-    const gfx::Size& contents_size,
-    gfx::Rect* contents_bounds,
-    gfx::Rect* window_bounds) {
-  // Arrow offset is calculated from the middle of the |position_relative_to|.
-  int offset = position_relative_to.x() + (position_relative_to.width() / 2);
-  offset -= bubble_anchor_.x();
-
-  gfx::Insets insets;
-  bubble_border()->GetInsets(&insets);
-  offset += content_margins().left() + insets.left() + 1;
-  bubble_border()->SetArrowOffset(offset, contents_size);
-
-  BorderContents::SizeAndGetBounds(
-      position_relative_to, arrow_location,
-      true,  // Don't move the bubble around if it does not fit on the screen.
-      contents_size, contents_bounds, window_bounds);
-
-  // Now move the y position to make sure the bubble contents overlap the view.
-  window_bounds->Offset(0, -(content_margins().top() + 1));
-}
-
-// Bubble -----------------------------------------------------------------
-
-// static
-PinnedContentsInfoBubble* PinnedContentsInfoBubble::Show(
-    views::Widget* parent,
-    const gfx::Rect& position_relative_to,
-    views::BubbleBorder::ArrowLocation arrow_location,
-    const gfx::Point& bubble_anchor,
-    views::View* contents,
-    BubbleDelegate* delegate) {
-  PinnedContentsInfoBubble* bubble =
-      new PinnedContentsInfoBubble(bubble_anchor);
-  bubble->InitBubble(parent, position_relative_to, arrow_location,
-                     views::BubbleBorder::ALIGN_ARROW_TO_MID_ANCHOR,
-                     contents, delegate);
-  return bubble;
-}
-
-BorderContents* PinnedContentsInfoBubble::CreateBorderContents() {
-  return new PinnedContentsBorderContents(bubble_anchor_);
-}