RNCWebViewManager.mWebChromeClient cause memory leak

[jinshiyi11]

Bug description:
in RNCWebViewManager.setupWebChromeClient function
mWebChromeClient = new RNCWebChromeClient(reactContext, webView)
mWebChromeClient hold reference to reactContext,which is current activity,but in onDropViewInstance the reference is not cleared,that cause memory leak

To Reproduce:
create RNCWebView instance ,then destroy it

Expected behavior:
no memory leak

Screenshots/Videos:

Environment:

• OS:android
• OS version:
• react-native version:0.60.5
• react-native-webview version:v7.2.5

[github-actions]

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