Use the correct remaining data length when parsing chunk headers.

chrome/browser/safe_browsing/protocol_parser_unittest.cc

Index: chrome/browser/safe_browsing/protocol_parser_unittest.cc
diff --git a/chrome/browser/safe_browsing/protocol_parser_unittest.cc b/chrome/browser/safe_browsing/protocol_parser_unittest.cc
index 8b7abe32528a6343c44abd8ded9b2916b6aa2e5c..ca53694af3ca23e63bbaf5c9dc475df53d708823 100644
--- a/chrome/browser/safe_browsing/protocol_parser_unittest.cc
+++ b/chrome/browser/safe_browsing/protocol_parser_unittest.cc
@@ -223,6 +223,21 @@ TEST(SafeBrowsingProtocolParsingTest, TestTruncatedUrlHashChunk) {
   EXPECT_EQ(chunks.size(), 0U);
 }
 
+// Test to verify handling of a truncated chunk header.
+TEST(SafeBrowsingProtocolParsingTest, TestTruncatedHeader) {
+  std::string truncated_chunks("a:1:4:0\na:");
+
+  // Run the parser.
+  SafeBrowsingProtocolParser parser;
+  SBChunkList chunks;
+  bool result = parser.ParseChunk(
+      safe_browsing_util::kMalwareList,
+      truncated_chunks.data(),
+      static_cast<int>(truncated_chunks.length()),
+      &chunks);
+  EXPECT_FALSE(result);
+}
+
 // Test parsing one sub chunk.
 TEST(SafeBrowsingProtocolParsingTest, TestSubChunk) {
   std::string sub_chunk("s:9:4:59\naaaaxkkkk1111\003"