Don't include the tracing in gpu_memory_buffer.h

ui/gfx/gpu_memory_buffer.cc

Index: ui/gfx/gpu_memory_buffer.cc
diff --git a/ui/gfx/gpu_memory_buffer.cc b/ui/gfx/gpu_memory_buffer.cc
index 1f9c1b092cc6d80151b4da54214684d08c819d73..569b588d5ad7b80c4c3594bf9d1b05a8ffc2b1ea 100644
--- a/ui/gfx/gpu_memory_buffer.cc
+++ b/ui/gfx/gpu_memory_buffer.cc
@@ -6,16 +6,6 @@
 
 namespace gfx {
 
-base::trace_event::MemoryAllocatorDumpGuid GetGpuMemoryBufferGUIDForTracing(
-    uint64_t tracing_process_id,
-    GpuMemoryBufferId buffer_id) {
-  // TODO(ericrk): Currently this function just wraps
-  // GetGenericSharedMemoryGUIDForTracing, we may want to special case this if
-  // the GPU memory buffer is not backed by shared memory.
-  return gfx::GetGenericSharedMemoryGUIDForTracing(tracing_process_id,
-                                                   buffer_id);
-}
-
 GpuMemoryBufferHandle::GpuMemoryBufferHandle()
     : type(EMPTY_BUFFER), id(0), handle(base::SharedMemory::NULLHandle()) {
 }