FileURLToFilePath: Don't unescape '/' and '\\'.

net/base/escape.h

Index: net/base/escape.h
diff --git a/net/base/escape.h b/net/base/escape.h
index c31dcf9aa2250899e76da977b168a9aafc82c596..f75d4502bc311b9a2cf24b71d53ed54241ce5b64 100644
--- a/net/base/escape.h
+++ b/net/base/escape.h
@@ -93,6 +93,12 @@ class UnescapeRule {
     // interpreting as a URL and want to do as much unescaping as possible.
     URL_SPECIAL_CHARS = 4,
 
+    // Subset of "URL_SPECIAL_CHARS" - excludes '/' and '\\'. For use with file
+    // URLs.
+    // TODO(mmenke): Should GURL unescape those two characters for file URLs?
+    // that's what FireFox and IE do.
+    URL_SPECIAL_CHARS_EXCEPT_PATH_SEPERATORS = 8,
+
     // Unescapes characters that can be used in spoofing attempts (such as LOCK)
     // and control characters (such as BiDi control characters and %01).  This
     // INCLUDES NULLs.  This is used for rare cases such as data: URL decoding
@@ -100,10 +106,10 @@ class UnescapeRule {
     //
     // DO NOT use SPOOFING_AND_CONTROL_CHARS if the URL is going to be displayed
     // in the UI for security reasons.
-    SPOOFING_AND_CONTROL_CHARS = 8,
+    SPOOFING_AND_CONTROL_CHARS = 16,
 
     // URL queries use "+" for space. This flag controls that replacement.
-    REPLACE_PLUS_WITH_SPACE = 16,
+    REPLACE_PLUS_WITH_SPACE = 32,
   };
 };