Avoid using language hint in encoding detection

third_party/WebKit/Source/platform/text/TextEncodingDetectorTest.cpp

 // Copyright 2016 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.
 
 #include "platform/text/TextEncodingDetector.h"
 
 #include "platform/weborigin/KURL.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "wtf/text/TextEncoding.h"
 
@@ skipping 63 matching lines @@
       "\xA5\xD1\xA5\xEF\xA1\xBC\xA5\xC1\xA5\xE3\xA1\xBC\xA5\xC8\xA1\xC3\xC5\xEA"
       "\xBB\xF1\xBE\xF0\xCA\xF3\xA4\xCE\xA5\xD5\xA5\xA3\xA5\xB9\xA5\xB3</"
       "TITLE>";
   WTF::TextEncoding encoding;
   bool result = detectTextEncoding(eucjpBytes.c_str(), eucjpBytes.length(),
                                    nullptr, KURL(), nullptr, &encoding);
   EXPECT_TRUE(result);
   EXPECT_EQ(WTF::TextEncoding("GBK"), encoding)
       << "Without language hint, it's detected as GBK";
 
+  KURL url(ParsedURLString, "http://example.com/");
   result = detectTextEncoding(eucjpBytes.c_str(), eucjpBytes.length(), nullptr,
-                              KURL(), "ja", &encoding);
+                              url, "ja", &encoding);
+  EXPECT_TRUE(result);
+  EXPECT_EQ(WTF::TextEncoding("GBK"), encoding)
+      << "Language hint doesn't help for normal URL. Should be detected as GBK";
+
+  KURL fileUrl(ParsedURLString, "file:///text.txt");
+  result = detectTextEncoding(eucjpBytes.c_str(), eucjpBytes.length(), nullptr,
+                              fileUrl, "ja", &encoding);
   EXPECT_TRUE(result);
   EXPECT_EQ(WTF::TextEncoding("EUC-JP"), encoding)
-      << "With language hint 'ja', it's detected as EUC-JP";
+      << "Language hint works for file resource. Should be detected as EUC-JP";
 }
 
 TEST(TextEncodingDetectorTest, UTF8DetectionShouldFail) {
   std::string utf8Bytes =
       "tnegirjji gosa gii beare s\xC3\xA1htt\xC3\xA1 \xC4\x8D\xC3"
       "\xA1llit artihkkaliid. Maid don s\xC3\xA1ht\xC3\xA1t dievasmah";
   WTF::TextEncoding encoding;
   bool result = detectTextEncoding(utf8Bytes.c_str(), utf8Bytes.length(),
                                    nullptr, KURL(), nullptr, &encoding);
   EXPECT_FALSE(result);
 }
 
 TEST(TextEncodingDetectorTest, RespectUTF8DetectionForFileResource) {
   std::string utf8Bytes =
       "tnegirjji gosa gii beare s\xC3\xA1htt\xC3\xA1 \xC4\x8D\xC3"
       "\xA1llit artihkkaliid. Maid don s\xC3\xA1ht\xC3\xA1t dievasmah";
   WTF::TextEncoding encoding;
   KURL fileUrl(ParsedURLString, "file:///text.txt");
   bool result = detectTextEncoding(utf8Bytes.c_str(), utf8Bytes.length(),
                                    nullptr, fileUrl, nullptr, &encoding);
   EXPECT_TRUE(result);
 }
 
 }  // namespace blink