Proof-read comments in src/url/.

Review URL: https://codereview.chromium.org/1270443006

Cr-Commit-Position: refs/heads/master@{#343473}
diff --git a/url/url_parse_internal.h b/url/url_parse_internal.h
index f1e0960..7630878 100644
--- a/url/url_parse_internal.h
+++ b/url/url_parse_internal.h
@@ -11,7 +11,7 @@
 
 namespace url {
 
-// We treat slashes and backslashes the same for IE compatability.
+// We treat slashes and backslashes the same for IE compatibility.
 inline bool IsURLSlash(base::char16 ch) {
   return ch == '/' || ch == '\\';
 }