Remove unused paintScrollbarThumb impl.

content/child/webthemeengine_impl_mac.cc

-// 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.
-
-#include "content/child/webthemeengine_impl_mac.h"
-
-#include <Carbon/Carbon.h>
-
-#include "skia/ext/skia_utils_mac.h"
-#include "third_party/WebKit/public/platform/WebCanvas.h"
-#include "third_party/WebKit/public/platform/WebRect.h"
-
-using blink::WebCanvas;
-using blink::WebRect;
-using blink::WebThemeEngine;
-
-namespace content {
-
-static ThemeTrackEnableState stateToHIEnableState(WebThemeEngine::State state) {
-  switch (state) {
-    case WebThemeEngine::StateDisabled:
-      return kThemeTrackDisabled;
-    case WebThemeEngine::StateInactive:
-      return kThemeTrackInactive;
-    default:
-      return kThemeTrackActive;
-  }
-}
-
-void WebThemeEngineImpl::paintScrollbarThumb(
-    WebCanvas* canvas,
-    WebThemeEngine::State state,
-    WebThemeEngine::Size size,
-    const WebRect& rect,
-    const WebThemeEngine::ScrollbarInfo& scrollbarInfo) {
-  HIThemeTrackDrawInfo trackInfo;
-  trackInfo.version = 0;
-  trackInfo.kind = size == WebThemeEngine::SizeRegular ?
-      kThemeMediumScrollBar : kThemeSmallScrollBar;
-  trackInfo.bounds = CGRectMake(rect.x, rect.y, rect.width, rect.height);
-  trackInfo.min = 0;
-  trackInfo.max = scrollbarInfo.maxValue;
-  trackInfo.value = scrollbarInfo.currentValue;
-  trackInfo.trackInfo.scrollbar.viewsize = scrollbarInfo.visibleSize;
-  trackInfo.attributes = 0;
-  if (scrollbarInfo.orientation ==
-      WebThemeEngine::ScrollbarOrientationHorizontal) {
-    trackInfo.attributes |= kThemeTrackHorizontal;
-  }
-
-  trackInfo.enableState = stateToHIEnableState(state);
-
-  trackInfo.trackInfo.scrollbar.pressState =
-      state == WebThemeEngine::StatePressed ? kThemeThumbPressed : 0;
-  trackInfo.attributes |= (kThemeTrackShowThumb | kThemeTrackHideTrack);
-  gfx::SkiaBitLocker bitLocker(canvas);
-  CGContextRef cgContext = bitLocker.cgContext();
-  HIThemeDrawTrack(&trackInfo, 0, cgContext, kHIThemeOrientationNormal);
-}
-
-}  // namespace content