FBTF: Fix more ctor/dtors found by clang plugin.

gpu/command_buffer/client/fenced_allocator.h

Index: gpu/command_buffer/client/fenced_allocator.h
diff --git a/gpu/command_buffer/client/fenced_allocator.h b/gpu/command_buffer/client/fenced_allocator.h
index fd162db410159ea626d41831051d714a58c28dc4..70d85f64a8b0d87e1ab9d35bfc50f3843dc32d64 100644
--- a/gpu/command_buffer/client/fenced_allocator.h
+++ b/gpu/command_buffer/client/fenced_allocator.h
@@ -33,11 +33,7 @@ class FencedAllocator {
   // Creates a FencedAllocator. Note that the size of the buffer is passed, but
   // not its base address: everything is handled as offsets into the buffer.
   FencedAllocator(unsigned int size,
-                  CommandBufferHelper *helper)
-      : helper_(helper) {
-    Block block = { FREE, 0, size, kUnusedToken };
-    blocks_.push_back(block);
-  }
+                  CommandBufferHelper *helper);
 
   ~FencedAllocator();