convert to emotion

Summary:
My benchmarks have shown react-emotion to be faster than the current implementation of `styled`. For this reason, I am converting all styling to [emotion](https://emotion.sh).

Benchmark results:
{F136839093}

The syntax is very similar between the two libraries. The main difference is that emotion only allows a single function for the whole style attribute, whereas the old implementation had functions for every style-attirbute.

Before:
```
{
  color: props => props.color,
  fontSize: props => props.size,
}
```

After:
```
props => ({
  color: props.color,
  fontSize: props.size,
})
```

Reviewed By: jknoxville

Differential Revision: D9479893

fbshipit-source-id: 2c39e4618f7e52ceacb67bbec8ae26114025723f

src/chrome/AutoUpdateVersion.js

@@ -5,19 +5,27 @@
  * @format
  */
 
-import {FlexRow, Text, colors, LoadingIndicator, Glyph, Component} from 'sonar';
+import {
+  FlexRow,
+  Text,
+  colors,
+  LoadingIndicator,
+  Glyph,
+  Component,
+  styled,
+} from 'sonar';
 import {remote} from 'electron';
 import isProduction from '../utils/isProduction.js';
 import config from '../fb-stubs/config.js';
 const version = remote.app.getVersion();
 
-const VersionText = Text.extends({
+const VersionText = styled(Text)({
   color: colors.light50,
   marginLeft: 4,
   marginTop: 2,
 });
 
-const Container = FlexRow.extends({
+const Container = styled(FlexRow)({
   alignItems: 'center',
 });