Revert of MacKeyboard: Don't generate keypress for non-printable char

content/browser/renderer_host/input/web_input_event_builders_mac.mm

Index: content/browser/renderer_host/input/web_input_event_builders_mac.mm
diff --git a/content/browser/renderer_host/input/web_input_event_builders_mac.mm b/content/browser/renderer_host/input/web_input_event_builders_mac.mm
index 723b6238ca760bb80833ef100c7fcf69ca46c2bf..1e116e84b939c24efb5f248caebe1e6f07c4f72f 100644
--- a/content/browser/renderer_host/input/web_input_event_builders_mac.mm
+++ b/content/browser/renderer_host/input/web_input_event_builders_mac.mm
@@ -117,34 +117,16 @@
   return false;
 }
 
-inline NSString* FilterSpecialCharacter(NSString* str) {
-  if ([str length] != 1)
-    return str;
-  unichar c = [str characterAtIndex:0];
-  NSString* result = str;
-  if (c == 0x7F) {
-    // Backspace should be 8
-    result = @"\x8";
-  } else if (c >= 0xF700 && c <= 0xF7FF) {
-    // Mac private use characters should be @"\0" (@"" won't work)
-    // NSDeleteFunctionKey will also go into here
-    // Use the range 0xF700~0xF7FF to match
-    // http://www.opensource.apple.com/source/WebCore/WebCore-7601.1.55/platform/mac/KeyEventMac.mm
-    result = @"\0";
-  }
-  return result;
-}
-
 inline NSString* TextFromEvent(NSEvent* event) {
   if ([event type] == NSFlagsChanged)
     return @"";
-  return FilterSpecialCharacter([event characters]);
+  return [event characters];
 }
 
 inline NSString* UnmodifiedTextFromEvent(NSEvent* event) {
   if ([event type] == NSFlagsChanged)
     return @"";
-  return FilterSpecialCharacter([event charactersIgnoringModifiers]);
+  return [event charactersIgnoringModifiers];
 }
 
 NSString* KeyIdentifierForKeyEvent(NSEvent* event) {
@@ -632,6 +614,14 @@
     unmodified_str = @"\r";
   }
 
+  // The adjustments below are only needed in backward compatibility mode,
+  // but we cannot tell what mode we are in from here.
+
+  // Turn 0x7F into 8, because backspace needs to always be 8.
+  if ([text_str isEqualToString:@"\x7F"])
+    text_str = @"\x8";
+  if ([unmodified_str isEqualToString:@"\x7F"])
+    unmodified_str = @"\x8";
   // Always use 9 for tab -- we don't want to use AppKit's different character
   // for shift-tab.
   if (result.windowsKeyCode == 9) {