(ios): rename CDVWKProcessPoolFactory (#825)

* (ios): rename CDVWKProcessPoolFactory

CDVWKProcessPoolFactory was integrated from the WKWebView plugin with
the new name: CDVWebViewProcessPoolFactory

* (ios): Allow both processpool imports

src/ios/CDVWKInAppBrowser.m

@@ -19,8 +19,10 @@ Licensed to the Apache Software Foundation (ASF) under one
 
 #import "CDVWKInAppBrowser.h"
 
-#if __has_include("CDVWKProcessPoolFactory.h")
-#import "CDVWKProcessPoolFactory.h"
+#if __has_include(<Cordova/CDVWebViewProcessPoolFactory.h>) // Cordova-iOS >=6
+  #import <Cordova/CDVWebViewProcessPoolFactory.h>
+#elif __has_include("CDVWKProcessPoolFactory.h") // Cordova-iOS <6 with WKWebView plugin
+  #import "CDVWKProcessPoolFactory.h"
 #endif
 
 #import <Cordova/CDVPluginResult.h>
@@ -739,7 +741,9 @@ - (void)createViews
     }
     configuration.applicationNameForUserAgent = userAgent;
     configuration.userContentController = userContentController;
-#if __has_include("CDVWKProcessPoolFactory.h")
+#if __has_include(<Cordova/CDVWebViewProcessPoolFactory.h>)
+    configuration.processPool = [[CDVWebViewProcessPoolFactory sharedFactory] sharedProcessPool];
+#elif __has_include("CDVWKProcessPoolFactory.h")
     configuration.processPool = [[CDVWKProcessPoolFactory sharedFactory] sharedProcessPool];
 #endif
     [configuration.userContentController addScriptMessageHandler:self name:IAB_BRIDGE_NAME];