Fix various problems with inline autocomplete and URLs that change length dur...

chrome/browser/autocomplete/autocomplete.cc

Index: chrome/browser/autocomplete/autocomplete.cc
===================================================================
--- chrome/browser/autocomplete/autocomplete.cc	(revision 31214)
+++ chrome/browser/autocomplete/autocomplete.cc	(working copy)
@@ -438,10 +438,6 @@
     size_t overall_length,
     int style,
     ACMatchClassifications* classification) {
-  // Classifying an empty match makes no sense and will lead to validation
-  // errors later.
-  DCHECK(match_length > 0);
-
   classification->clear();
 
   // Don't classify anything about an empty string
@@ -459,6 +455,9 @@
     // No match, above classification will suffice for whole string.
     return;
   }
+  // Classifying an empty match makes no sense and will lead to validation
+  // errors later.
+  DCHECK(match_length > 0);
   classification->push_back(ACMatchClassification(match_location,
       (style | ACMatchClassification::MATCH) & ~ACMatchClassification::DIM));