Revise about: and chrome: url handling.

chrome/browser/net/url_fixer_upper.cc

Index: chrome/browser/net/url_fixer_upper.cc
diff --git a/chrome/browser/net/url_fixer_upper.cc b/chrome/browser/net/url_fixer_upper.cc
index 10d930b0fa6c2aeb71860d435f874d0b544d4326..37125d02cd4176fa394c8ef3e03da2f2e9b58964 100644
--- a/chrome/browser/net/url_fixer_upper.cc
+++ b/chrome/browser/net/url_fixer_upper.cc
@@ -406,10 +406,10 @@ std::string URLFixerUpper::SegmentURL(const std::string& text,
         chrome::kFtpScheme : chrome::kHttpScheme);
   }
 
-  // Not segmenting file schemes or nonstandard schemes.
-  if ((scheme == chrome::kFileScheme) ||
-      !url_util::IsStandard(scheme.c_str(),
-      url_parse::Component(0, static_cast<int>(scheme.length()))))
+  // Proceed with about and chrome schemes, but not file or nonstandard schemes.
+  if ((scheme != chrome::kAboutScheme) && (scheme != chrome::kChromeUIScheme) &&
+      ((scheme == chrome::kFileScheme) || !url_util::IsStandard(scheme.c_str(),
+           url_parse::Component(0, static_cast<int>(scheme.length())))))
     return scheme;
 
   if (parts->scheme.is_valid()) {
@@ -427,7 +427,7 @@ std::string URLFixerUpper::SegmentURL(const std::string& text,
 
   // Construct the text to parse by inserting the scheme.
   std::string inserted_text(scheme);
-  inserted_text.append("://");
+  inserted_text.append(chrome::kStandardSchemeSeparator);
   std::string text_to_parse(text.begin(), first_nonwhite);
   text_to_parse.append(inserted_text);
   text_to_parse.append(first_nonwhite, text.end());
@@ -478,11 +478,16 @@ GURL URLFixerUpper::FixupURL(const std::string& text,
   if (scheme == chrome::kFileScheme)
     return GURL(parts.scheme.is_valid() ? text : FixupPath(text));
 
+  // Parse and rebuild about: and chrome: URLs, except about:blank.
+  bool chrome_url = !LowerCaseEqualsASCII(trimmed, chrome::kAboutBlankURL) &&
+      ((scheme == chrome::kAboutScheme) || (scheme == chrome::kChromeUIScheme));
+
   // For some schemes whose layouts we understand, we rebuild it.
-  if (url_util::IsStandard(scheme.c_str(),
+  if (chrome_url || url_util::IsStandard(scheme.c_str(),
           url_parse::Component(0, static_cast<int>(scheme.length())))) {
-    std::string url(scheme);
-    url.append("://");
+    // Replace the about: scheme with the chrome: scheme.
+    std::string url(chrome_url ? chrome::kChromeUIScheme : scheme);
+    url.append(chrome::kStandardSchemeSeparator);
 
     // We need to check whether the |username| is valid because it is our
     // responsibility to append the '@' to delineate the user information from
@@ -494,6 +499,8 @@ GURL URLFixerUpper::FixupURL(const std::string& text,
     }
 
     FixupHost(trimmed, parts.host, parts.scheme.is_valid(), desired_tld, &url);
+    if (chrome_url && !parts.host.is_valid())
+      url.append(chrome::kChromeUIDefaultHost);
     FixupPort(trimmed, parts.port, &url);
     FixupPath(trimmed, parts.path, &url);
     FixupQuery(trimmed, parts.query, &url);
@@ -505,7 +512,7 @@ GURL URLFixerUpper::FixupURL(const std::string& text,
   // In the worst-case, we insert a scheme if the URL lacks one.
   if (!parts.scheme.is_valid()) {
     std::string fixed_scheme(scheme);
-    fixed_scheme.append("://");
+    fixed_scheme.append(chrome::kStandardSchemeSeparator);
     trimmed.insert(0, fixed_scheme);
   }