Removed unused bowser library use from shim

* Shim before size 17.1KiB, now 8.4KiB! (before gzip)
* Moved redetectBrowserUserAgent implementation into OneSignalUtils.ts

src/utils/BrowserSupportsPush.ts

@@ -1,27 +1,10 @@
 // This is used by the OneSignalSDK.js shim
 // DO NOT add other imports since it is an ES5 target and dead code imports can't be clean up.
 
-import { IBowser } from "bowser";
-import bowser from "bowser";
-
-export function redetectBrowserUserAgent(): IBowser {
-  /*
-   TODO: Make this a little neater
-   During testing, the browser object may be initialized before the userAgent is injected
-  */
-  let browser: IBowser;
-  if (bowser.name === '' && bowser.version === '') {
-    browser = bowser._detect(navigator.userAgent);
-  } else {
-    browser = bowser;
-  }
-  return browser;
-}
-
 // Checks if the browser supports push notifications by checking if specific
 //   classes and properties on them exist
 
-// Safari -
+// Safari
 //   macOS - typeof safari.pushNotification == "object"
 //   iOS -  typeof safari == "undefined"
 // Chrome

src/utils/OneSignalUtils.ts

@@ -3,7 +3,6 @@ import SdkEnvironment from "../managers/SdkEnvironment";
 import { WindowEnvironmentKind } from "../models/WindowEnvironmentKind";
 import Log from "../libraries/Log";
 import { Utils } from "./Utils";
-import { redetectBrowserUserAgent } from "./BrowserSupportsPush";
 
 export class OneSignalUtils {
   public static getBaseUrl() {
@@ -73,7 +72,11 @@ export class OneSignalUtils {
   }
 
   public static redetectBrowserUserAgent(): IBowser {
-    return redetectBrowserUserAgent();
+    // During testing, the browser object may be initialized before the userAgent is injected
+    if (bowser.name === '' && bowser.version === '') {
+      return bowser._detect(navigator.userAgent);
+    }
+    return bowser;
   }
 
   /**