[ios] Implemented LoadHtml w/o using data:// URLs.

ios/web/web_state/ui/crw_web_controller.mm

Index: ios/web/web_state/ui/crw_web_controller.mm
diff --git a/ios/web/web_state/ui/crw_web_controller.mm b/ios/web/web_state/ui/crw_web_controller.mm
index 0960224271346d774722efe5cafe0ab5dd7a4710..e7fe4f3c9eb05ce6788928bf465f04c870a81dd1 100644
--- a/ios/web/web_state/ui/crw_web_controller.mm
+++ b/ios/web/web_state/ui/crw_web_controller.mm
@@ -4767,8 +4767,9 @@ const NSTimeInterval kSnapshotOverlayTransition = 0.5;
   // Remove the transient content view.
   [self clearTransientContentView];
 
-  DLOG_IF(WARNING, !_webView) << "_webView null while trying to load HTML";
   _loadPhase = web::LOAD_REQUESTED;
+  [self ensureWebViewCreated];
+  DCHECK(_webView) << "_webView null while trying to load HTML";
   [_webView loadHTMLString:HTML baseURL:net::NSURLWithGURL(URL)];
 }
 
@@ -4975,13 +4976,6 @@ const NSTimeInterval kSnapshotOverlayTransition = 0.5;
     }
   }
 
-  if (!allowLoad && action.targetFrame.isMainFrame) {
-    // WKWebView will stop this navigation without calling any further
-    // callbacks, so change load phase to loaded now.
-    _loadPhase = web::PAGE_LOADED;
-    _webStateImpl->SetIsLoading(false);
-  }
-
   decisionHandler(allowLoad ? WKNavigationActionPolicyAllow
                             : WKNavigationActionPolicyCancel);
 }