Strip .plugin off of Mac plugin names when showing the crash info bar.

base/string_util.h

Index: base/string_util.h
diff --git a/base/string_util.h b/base/string_util.h
index c7f31153172ca22a688a718cad1825bea248c62d..0ae0185b057f599c66738c500386f07fcc928ce3 100644
--- a/base/string_util.h
+++ b/base/string_util.h
@@ -363,6 +363,12 @@ bool StartsWith(const std::wstring& str,
                 const std::wstring& search,
                 bool case_sensitive);
 
+// Returns true if str ends with search, or false otherwise.
+bool EndsWith(const std::wstring& str,
+              const std::wstring& search,
+              bool case_sensitive);
+
+
 // Determines the type of ASCII character, independent of locale (the C
 // library versions will change based on locale).
 template <typename Char>