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

ios/web/web_state/ui/crw_web_controller_unittest.mm

Index: ios/web/web_state/ui/crw_web_controller_unittest.mm
diff --git a/ios/web/web_state/ui/crw_web_controller_unittest.mm b/ios/web/web_state/ui/crw_web_controller_unittest.mm
index 50832d9f32fa561457be7163a119864281f70c57..e3f2780e662a7d3199377919cd4f5ad2c071c4c8 100644
--- a/ios/web/web_state/ui/crw_web_controller_unittest.mm
+++ b/ios/web/web_state/ui/crw_web_controller_unittest.mm
@@ -196,7 +196,12 @@ typedef BOOL (^openExternalURLBlockType)(const GURL&);
 - (web::BlockedPopupInfo*)blockedPopupInfo {
   return _blockedPopupInfo.get();
 }
-
+- (BOOL)webController:(CRWWebController*)webController
+        shouldOpenURL:(const GURL&)URL
+      mainDocumentURL:(const GURL&)mainDocumentURL
+          linkClicked:(BOOL)linkClicked {
+  return YES;
+}
 @end
 
 @interface CountingObserver : NSObject<CRWWebControllerObserver>