[Cronet] Don't claim support of UrlRequests with data URL scheme.

components/cronet/ios/test/cronet_http_test.mm

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import <Cronet/Cronet.h>
 #import <Foundation/Foundation.h>
 
 #include <stdint.h>
 
 #include "base/logging.h"
@@ skipping 380 matching lines @@
     [[NSFileManager defaultManager] removeItemAtPath:filePath error:nil];
     EXPECT_TRUE(false) << "Block should not be called for unsupported requests";
     return YES;
   }];
   StartDataTaskAndWaitForCompletion(task);
   [[NSFileManager defaultManager] removeItemAtPath:filePath error:nil];
   EXPECT_EQ(nil, [delegate_ error]);
   EXPECT_TRUE([[delegate_ responseBody] containsString:fileData]);
 }
 
+TEST_F(HttpTest, DataSchemeNotSupported) {
+  NSString* testString = @"Hello, World!";
+  NSData* testData = [testString dataUsingEncoding:NSUTF8StringEncoding];
+  NSString* dataString =
+      [NSString stringWithFormat:@"data:text/plain;base64,%@",
+                                 [testData base64EncodedStringWithOptions:0]];
+  NSURL* url = [NSURL URLWithString:dataString];
+  NSURLSessionDataTask* task = [session_ dataTaskWithURL:url];
+  [Cronet setRequestFilterBlock:^(NSURLRequest* request) {
+    EXPECT_TRUE(false) << "Block should not be called for unsupported requests";
+    return YES;
+  }];
+  StartDataTaskAndWaitForCompletion(task);
+  EXPECT_EQ(nil, [delegate_ error]);
+  EXPECT_TRUE([[delegate_ responseBody] containsString:testString]);
+}
+
 }  // namespace cronet