[Mac, Win] Don't allow blank spaces in profile names in the new avatar bubble.

chrome/browser/ui/cocoa/profiles/profile_chooser_controller.mm

Index: chrome/browser/ui/cocoa/profiles/profile_chooser_controller.mm
diff --git a/chrome/browser/ui/cocoa/profiles/profile_chooser_controller.mm b/chrome/browser/ui/cocoa/profiles/profile_chooser_controller.mm
index b94e3f46d6005b34f086516cd492b84fc4068ae1..8b6eccfb14a9625d5d6371461c1dc6a37f9b72cd 100644
--- a/chrome/browser/ui/cocoa/profiles/profile_chooser_controller.mm
+++ b/chrome/browser/ui/cocoa/profiles/profile_chooser_controller.mm
@@ -619,13 +619,19 @@ class ActiveProfileObserverBridge : public AvatarMenuObserver,
 }
 
 - (void)saveProfileName:(id)sender {
-  NSString* text = [profileNameTextField_ stringValue];
+  base::string16 newProfileName =
+      base::SysNSStringToUTF16([profileNameTextField_ stringValue]);
+
   // Empty profile names are not allowed, and are treated as a cancel.
-  if ([text length] > 0) {
-    profiles::UpdateProfileName(profile_, base::SysNSStringToUTF16(text));
+  base::TrimWhitespace(newProfileName, base::TRIM_ALL, &newProfileName);
+  if (!newProfileName.empty()) {
+    profiles::UpdateProfileName(profile_, newProfileName);
     [controller_
         postActionPerformed:ProfileMetrics::PROFILE_DESKTOP_MENU_EDIT_NAME];
-    [self setTitle:text];
+    [self setTitle:base::SysUTF16ToNSString(newProfileName)];
+  } else {
+    // Since the text is empty and not allowed, revert it from the textbox.
+    [profileNameTextField_ setStringValue:[self title]];
   }
   [profileNameTextField_ setHidden:YES];
 }