Switch to narrowest scope for a static, per suggestion in a review on another file.

chrome/browser/webdata/logins_table.cc

Index: chrome/browser/webdata/logins_table.cc
diff --git a/chrome/browser/webdata/logins_table.cc b/chrome/browser/webdata/logins_table.cc
index 2edc60f482d32770469a18aeef58ca25072f9c1e..cfb24ab79710fe63b9875649cf800c621b296a46 100644
--- a/chrome/browser/webdata/logins_table.cc
+++ b/chrome/browser/webdata/logins_table.cc
@@ -12,9 +12,10 @@
 
 namespace {
 
-int table_key = 0;
-
 WebDatabaseTable::TypeKey GetKey() {
+  // We just need a unique constant. Use the address of a static that
+  // COMDAT folding won't touch in an optimizing linker.
+  static int table_key = 0;
   return reinterpret_cast<void*>(&table_key);
 }