fix pointer style to match the style guide

We do this in a lot of places, but we're inconsistent.
Normalize the code to the Google C++ style guide.

Change-Id: Ic2aceab661ce8f6b993dda21b1cdf5d2198dcbbf
Reviewed-on: https://chromium-review.googlesource.com/c/breakpad/breakpad/+/2262932
Reviewed-by: Sterling Augustine <saugustine@google.com>
Reviewed-by: Mark Mentovai <mark@chromium.org>

src/processor/static_map_iterator-inl.h

@@ -43,7 +43,7 @@ namespace google_breakpad {
 
 template<typename Key, typename Value, typename Compare>
 StaticMapIterator<Key, Value, Compare>::StaticMapIterator(const char* base,
-                                                            const int &index):
+                                                            const int& index):
       index_(index), base_(base) {
   // See static_map.h for documentation on
   // bytes format of serialized StaticMap data.