Port autocomplete_edit_view_browsertest.cc to Mac.

chrome/browser/ui/cocoa/location_bar/autocomplete_text_field_editor.mm

Index: chrome/browser/ui/cocoa/location_bar/autocomplete_text_field_editor.mm
diff --git a/chrome/browser/ui/cocoa/location_bar/autocomplete_text_field_editor.mm b/chrome/browser/ui/cocoa/location_bar/autocomplete_text_field_editor.mm
index 0b894919340914cccf9cd078b08d1395851d173a..9ed6ebd17dd6f96867958511ded3e16fc799672d 100644
--- a/chrome/browser/ui/cocoa/location_bar/autocomplete_text_field_editor.mm
+++ b/chrome/browser/ui/cocoa/location_bar/autocomplete_text_field_editor.mm
@@ -308,9 +308,13 @@
   DCHECK(!interpretingKeyEvents_);
   interpretingKeyEvents_ = YES;
   textChangedByKeyEvents_ = NO;
+  AutocompleteTextFieldObserver* observer = [self observer];
+
+  if (observer)
+    observer->OnBeforeChange();
+
   [super interpretKeyEvents:eventArray];
 
-  AutocompleteTextFieldObserver* observer = [self observer];
   if (textChangedByKeyEvents_ && observer)
     observer->OnDidChange();
 
@@ -318,6 +322,19 @@
   interpretingKeyEvents_ = NO;
 }
 
+- (BOOL)shouldChangeTextInRange:(NSRange)affectedCharRange
+              replacementString:(NSString *)replacementString {
+  BOOL ret = [super shouldChangeTextInRange:affectedCharRange
+                          replacementString:replacementString];
+
+  if (ret && !interpretingKeyEvents_) {
+    AutocompleteTextFieldObserver* observer = [self observer];
+    if (observer)
+      observer->OnBeforeChange();
+  }
+  return ret;
+}
+
 - (void)didChangeText {
   [super didChangeText];