forked from firka/flutter
ff7829558f2ca9c7aa03de860bd95c0e70fff93b
Fixes the following:
c8aa0844f2 results in the following error appearing internally when compiling for Android:
```
In file included from fml/synchronization/sync_switch.cc:5:
./fml/synchronization/sync_switch.h:74:34: error: implicit instantiation of undefined template 'std::vector<fml::SyncSwitch::Observer *>'
mutable std::vector<Observer*> observers_;
^
<...>: note: template is declared here
class _LIBCPP_TEMPLATE_VIS vector;
^
1 error generated.
```
*List which issues are fixed by this PR. You must list at least one issue.*
b/306266542
[C++, Objective-C, Java style guides]: https://github.com/flutter/engine/blob/main/CONTRIBUTING.md#style
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