Add a replace_all param to ReplaceSubstringsAfterOffset and update call sites.

base/string_util.h

Index: base/string_util.h
diff --git a/base/string_util.h b/base/string_util.h
index 601d1d87398e3317fe7a938951ff76666408e02b..6d7ff94affaf5634450d511233c94eef0a81d856 100644
--- a/base/string_util.h
+++ b/base/string_util.h
@@ -320,6 +320,17 @@ std::wstring FormatSpeed(int64 bytes, DataUnits units, bool show_units);
 // Ex: FormatNumber(1234567) => 1,234,567
 std::wstring FormatNumber(int64 number);
 
+// Starting at |start_offset| (usually 0), replace the first instance of
+// |find_this| with |replace_with|.
+void ReplaceFirstSubstringAfterOffset(std::wstring* str,
+                                      std::wstring::size_type start_offset,
+                                      const std::wstring& find_this,
+                                      const std::wstring& replace_with);
+void ReplaceFirstSubstringAfterOffset(std::string* str,
+                                      std::string::size_type start_offset,
+                                      const std::string& find_this,
+                                      const std::string& replace_with);
+
 // Starting at |start_offset| (usually 0), look through |str| and replace all
 // instances of |find_this| with |replace_with|.
 //