Complete WebStateObserverBridge and follow Cocoa naming style.

ios/chrome/browser/autofill/form_input_accessory_view_controller.mm

 // Copyright 2014 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 "ios/chrome/browser/autofill/form_input_accessory_view_controller.h"
 
 #include "base/ios/block_types.h"
 #include "base/mac/foundation_util.h"
 #include "base/mac/scoped_block.h"
 #include "base/mac/scoped_nsobject.h"
@@ skipping 344 matching lines @@
         (void (^)(BOOL, BOOL))completionHandler {
   DCHECK(completionHandler);
   [_JSSuggestionManager
       fetchPreviousAndNextElementsPresenceWithCompletionHandler:
           completionHandler];
 }
 
 #pragma mark -
 #pragma mark CRWWebStateObserver
 
-- (void)pageLoaded:(web::WebState*)webState {
+- (void)webStateDidLoadPage:(web::WebState*)webState {
   [self reset];
 }
 
-- (void)formActivity:(web::WebState*)webState
-            formName:(const std::string&)formName
-           fieldName:(const std::string&)fieldName
-                type:(const std::string&)type
-               value:(const std::string&)value
-             keyCode:(int)keyCode
-               error:(BOOL)error {
+- (void)webState:(web::WebState*)webState
+    didRegisterFormActivityWithFormNamed:(const std::string&)formName
+                               fieldName:(const std::string&)fieldName
+                                    type:(const std::string&)type
+                                   value:(const std::string&)value
+                                 keyCode:(int)keyCode
+                            inputMissing:(BOOL)inputMissing {
   web::URLVerificationTrustLevel trustLevel;
   const GURL pageURL(webState->GetCurrentURL(&trustLevel));
-  if (error || trustLevel != web::URLVerificationTrustLevel::kAbsolute ||
+  if (inputMissing || trustLevel != web::URLVerificationTrustLevel::kAbsolute ||
       !web::UrlHasWebScheme(pageURL) || !webState->ContentIsHTML()) {
     [self reset];
     return;
   }
 
   if ((type == "blur" || type == "change")) {
     return;
   }
 
   [self retrieveAccessoryViewForForm:formName
@@ skipping 109 matching lines @@
   }
   _keyboardFrame = keyboardFrame;
   [_currentProvider resizeAccessoryView];
 }
 
 - (void)keyboardDidHide:(NSNotification*)notification {
   _keyboardFrame = CGRectZero;
 }
 
 @end