content: Some code cleanup related to shared memory allocation.

content/child/child_shared_bitmap_manager.cc

Index: content/child/child_shared_bitmap_manager.cc
diff --git a/content/child/child_shared_bitmap_manager.cc b/content/child/child_shared_bitmap_manager.cc
index 00b461c7e96baad1d89e7d8717ff523cdaf132b4..a4267a7ddbc537dc2b7489c949fa27fdb951ef8b 100644
--- a/content/child/child_shared_bitmap_manager.cc
+++ b/content/child/child_shared_bitmap_manager.cc
@@ -122,8 +122,7 @@ ChildSharedBitmapManager::AllocateSharedMemoryBitmap(const gfx::Size& size) {
     CollectMemoryUsageAndDie(size, memory_size);
 #else
   bool out_of_memory;
-  memory = ChildThreadImpl::AllocateSharedMemory(memory_size, sender_.get(),
-                                                 &out_of_memory);
+  memory = ChildThreadImpl::AllocateSharedMemory(memory_size, &out_of_memory);
   if (!memory) {
     if (out_of_memory) {
       CollectMemoryUsageAndDie(size, memory_size);