Fix network plugin bug

Summary:
Some network requests are yielding error: e.getMessage() is not a function.
It shouldn't be .getMessage(), it should be .message

Reviewed By: priteshrnandgaonkar

Differential Revision: D13137334

fbshipit-source-id: 72c782376c8e62a05c5e9ce1b956566ce1fc5bf0

src/plugins/network/RequestDetails.js

@@ -346,7 +346,7 @@ class RequestBodyInspector extends Component<{
         } catch (e) {
           console.warn(
             'BodyFormatter exception from ' + formatter.constructor.name,
-            e.getMessage(),
+            e.message,
           );
         }
       }
@@ -377,7 +377,7 @@ class ResponseBodyInspector extends Component<{
         } catch (e) {
           console.warn(
             'BodyFormatter exception from ' + formatter.constructor.name,
-            e.getMessage(),
+            e.message,
           );
         }
       }