Move StartsWith[ASCII] to base namespace.

net/base/mime_util.cc

Index: net/base/mime_util.cc
diff --git a/net/base/mime_util.cc b/net/base/mime_util.cc
index 4c0d1e0cb7c19ca86903525f301d1331d124de8f..4468fc4d6e0f9c790084da8161a44a06b8135570 100644
--- a/net/base/mime_util.cc
+++ b/net/base/mime_util.cc
@@ -283,7 +283,7 @@ bool MimeUtil::MatchesMimeType(const std::string& mime_type_pattern,
   const std::string left(base_pattern.substr(0, star));
   const std::string right(base_pattern.substr(star + 1));
 
-  if (!StartsWithASCII(base_type, left, false))
+  if (!base::StartsWithASCII(base_type, left, false))
     return false;
 
   if (!right.empty() && !EndsWith(base_type, right, false))
@@ -330,7 +330,8 @@ bool MimeUtil::IsValidTopLevelMimeType(const std::string& type_string) const {
       return true;
   }
 
-  return type_string.size() > 2 && StartsWithASCII(type_string, "x-", false);
+  return type_string.size() > 2 &&
+         base::StartsWithASCII(type_string, "x-", false);
 }
 
 //----------------------------------------------------------------------------
@@ -457,7 +458,8 @@ void GetExtensionsFromHardCodedMappings(
     const std::string& leading_mime_type,
     base::hash_set<base::FilePath::StringType>* extensions) {
   for (size_t i = 0; i < mappings_len; ++i) {
-    if (StartsWithASCII(mappings[i].mime_type, leading_mime_type, false)) {
+    if (base::StartsWithASCII(mappings[i].mime_type, leading_mime_type,
+                              false)) {
       std::vector<string> this_extensions;
       base::SplitString(mappings[i].extensions, ',', &this_extensions);
       for (size_t j = 0; j < this_extensions.size(); ++j) {