Upgrade AlignedMemory to support dynamic allocations.

base/stack_container.h

Index: base/stack_container.h
diff --git a/base/stack_container.h b/base/stack_container.h
index c5897836db96b163d144121e4337ca190476523d..310ca5d9a7a76024d6174ff6f452f2cd4f064be6 100644
--- a/base/stack_container.h
+++ b/base/stack_container.h
@@ -52,7 +52,7 @@ class StackAllocator : public std::allocator<T> {
     // The buffer itself. It is not of type T because we don't want the
     // constructors and destructors to be automatically called. Define a POD
     // buffer of the right size instead.
-    base::AlignedMemory<sizeof(T[stack_capacity]), ALIGNOF(T)> stack_buffer_;
+    base::AlignedMemory<ALIGNOF(T), sizeof(T[stack_capacity])> stack_buffer_;
 #if defined(OS_ANDROID)
     COMPILE_ASSERT(ALIGNOF(T) <= 16, crbug_115612);
 #endif