Update dangling markup mitigations.

url/url_canon.h

Index: url/url_canon.h
diff --git a/url/url_canon.h b/url/url_canon.h
index d093f359fe18f244184b1163311b6fa8b4ac2e97..887150b0591791b250610321932f249e4d14929b 100644
--- a/url/url_canon.h
+++ b/url/url_canon.h
@@ -231,14 +231,21 @@ class URL_EXPORT CharsetConverter {
 //
 // Therefore, callers should not use the buffer, since it may actually be empty,
 // use the computed pointer and |*output_len| instead.
-URL_EXPORT const char* RemoveURLWhitespace(const char* input, int input_len,
+//
+// If |input| contained both removable whitespace and a raw `<` character,
+// |potentially_dangling_markup| will be set to `true`. Otherwise, it will be
+// left untouched.
+URL_EXPORT const char* RemoveURLWhitespace(const char* input,
+                                           int input_len,
                                            CanonOutputT<char>* buffer,
-                                           int* output_len);
+                                           int* output_len,
+                                           bool* potentially_dangling_markup);
 URL_EXPORT const base::char16* RemoveURLWhitespace(
     const base::char16* input,
     int input_len,
     CanonOutputT<base::char16>* buffer,
-    int* output_len);
+    int* output_len,
+    bool* potentially_dangling_markup);
 
 // IDN ------------------------------------------------------------------------