Makes enter/shift-enter find next/previous on Mac.

chrome/browser/cocoa/find_bar_cocoa_controller.mm

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import <Cocoa/Cocoa.h>
 
 #include "app/l10n_util.h"
 #include "base/mac_util.h"
 #include "base/sys_string_conversions.h"
 #include "grit/generated_resources.h"
@@ skipping 78 matching lines @@
   if (findText.length() > 0) {
     tab_contents->StartFinding(findText, true, false);
   } else {
     // The textbox is empty so we reset.
     tab_contents->StopFinding(true);  // true = clear selection on page.
     [self updateUIForFindResult:tab_contents->find_result()
           withText:string16()];
   }
 }
 
+// NSControl delegate method
+- (BOOL)control:(NSControl*)control
+    textView:(NSTextView*)textView
+    doCommandBySelector:(SEL)command {
+  if (command == @selector(insertNewline:)) {
+    NSEvent* event = [NSApp currentEvent];
+
+    if ([event modifierFlags] & NSShiftKeyMask)
+      [previousButton_ performClick:nil];
+    else {
+      [nextButton_ performClick:nil];
+    }
+
+    return YES;
+  }
+
+  return NO;
+}
+
 // Methods from FindBar
 - (void)showFindBar {
   [[self view] setHidden:NO];
 }
 
 - (void)hideFindBar {
   [[self view] setHidden:YES];
 }
 
 - (void)setFocusAndSelection {
@@ skipping 40 matching lines @@
     // area.
     [resultsLabel_ setStringValue:@""];
   }
 }
 
 - (BOOL)isFindBarVisible {
   return [[self view] isHidden] ? NO : YES;
 }
 
 @end