rename fill attribute

Summary:
We were using `fill={true}` as an attribute to make flexbox containers fill the entire available space.

However, `fill` is an HTML attribute (see: https://developer.mozilla.org/en-US/docs/Web/SVG/Attribute/fill) This caused warnings printed to the console.

This diff renames the attribute to `grow` with is also more in line with the Flexbox terminology.

Reviewed By: priteshrnandgaonkar

Differential Revision: D10488389

fbshipit-source-id: ed8553c6203cdf6df94d26c731164ecec4c9fbd2

src/chrome/BugReporterDialog.js

@@ -183,7 +183,7 @@ export default class BugReporterDialog extends Component<Props, State> {
 
     if (success) {
       content = (
-        <FlexCenter fill={true}>
+        <FlexCenter grow={true}>
           <FlexColumn>
             <Text>
               <Text>Bug </Text>
@@ -204,7 +204,7 @@ export default class BugReporterDialog extends Component<Props, State> {
       );
     } else {
       content = (
-        <Container fill={true}>
+        <Container grow={true}>
           <TitleInput
             placeholder="Title..."
             value={title}