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yk3372 9dc0385405 fix memory leak

Summary:
Signed-off-by: yk3372 <yk3372@gmail.com>

What existing problem does the pull request solve?

ViewManagersPropertyCache, ViewManagerPropertyUpdater static field not release when ReactInstanceManager called destroy.

I use this url to integrate RN:
[http://facebook.github.io/react-native/docs/integration-with-existing-apps.html](http://facebook.github.io/react-native/docs/integration-with-existing-apps.html)
and in Activity's onDestroy function add the follow code to release RN:
```java
mReactInstanceManager.destroy();
mReactInstanceManager = null;
```
and then when I exit activity, find the static field not release.
the follow is screen shot:
before:
![2017-05-23 17 41 16](https://cloud.githubusercontent.com/assets/1514899/26350318/53ea250c-3fe5-11e7-8eda-a0dcc20ba4f6.jpg)
after:
![2017-05-23 17 38 49](https://cloud.githubusercontent.com/assets/1514899/26350329/5e5b273e-3fe5-11e7-9b0b-a8b0e044abf3.jpg)
Closes https://github.com/facebook/react-native/pull/14172

Differential Revision: D5128834

Pulled By: javache

fbshipit-source-id: 657763fa21fd8826b4060f9a17e7f35f0e1e04d3

2017-05-25 03:01:31 -07:00