mac: Remove IsOSLion().

content/renderer/render_thread_impl.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 "content/renderer/render_thread_impl.h"
 
 #include <algorithm>
 #include <limits>
 #include <map>
 #include <utility>
@@ skipping 743 matching lines @@
   is_threaded_animation_enabled_ =
       !command_line.HasSwitch(cc::switches::kDisableThreadedAnimation);
 
   is_zero_copy_enabled_ = command_line.HasSwitch(switches::kEnableZeroCopy);
   is_partial_raster_enabled_ =
       !command_line.HasSwitch(switches::kDisablePartialRaster);
   is_gpu_memory_buffer_compositor_resources_enabled_ = command_line.HasSwitch(
       switches::kEnableGpuMemoryBufferCompositorResources);
 
 #if defined(OS_MACOSX)
-  is_elastic_overscroll_enabled_ = base::mac::IsOSLionOrLater();
-  if (is_elastic_overscroll_enabled_) {
-    base::ScopedCFTypeRef<CFStringRef> key(
-        base::SysUTF8ToCFStringRef("NSScrollViewRubberbanding"));
-    Boolean key_exists = false;
-    Boolean value = CFPreferencesGetAppBooleanValue(
-        key, kCFPreferencesCurrentApplication, &key_exists);
-    if (key_exists && !value)
-      is_elastic_overscroll_enabled_ = false;
-  }
+  base::ScopedCFTypeRef<CFStringRef> key(
+      base::SysUTF8ToCFStringRef("NSScrollViewRubberbanding"));
+  Boolean key_exists = false;
+  Boolean value = CFPreferencesGetAppBooleanValue(
+      key, kCFPreferencesCurrentApplication, &key_exists);
+  if (key_exists && !value)
+    is_elastic_overscroll_enabled_ = false;
+  else
+    is_elastic_overscroll_enabled_ = true;

[tapted, 2016/04/25 21:25:46]

nit: maybe
  is_elastic_oberscroll_enabled_ = !key_exists || value;

[Nico, 2016/04/26 14:30:44]

Done.

 #else
   is_elastic_overscroll_enabled_ = false;
 #endif
 
   std::string image_texture_target_string =
       command_line.GetSwitchValueASCII(switches::kContentImageTextureTarget);
   StringToUintVector(image_texture_target_string, &use_image_texture_targets_);
 
   if (command_line.HasSwitch(switches::kDisableLCDText)) {
     is_lcd_text_enabled_ = false;
@@ skipping 1329 matching lines @@
 }
 
 void RenderThreadImpl::PendingRenderFrameConnect::OnConnectionError() {
   size_t erased =
       RenderThreadImpl::current()->pending_render_frame_connects_.erase(
           routing_id_);
   DCHECK_EQ(1u, erased);
 }
 
 }  // namespace content