Add missing (and remove superfluous) 'explicit' from constructors.

chrome/browser/autofill/autofill_manager_unittest.cc

 // Copyright (c) 2012 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.
 
 #include <algorithm>
 #include <vector>
 
 #include "base/command_line.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/scoped_vector.h"
@@ skipping 3131 matching lines @@
                                            content::SSLStatus());
 
   EXPECT_EQ(1, autofill_manager_->request_autocomplete_error_count());
 }
 
 namespace {
 
 class MockAutofillExternalDelegate :
       public autofill::TestAutofillExternalDelegate {
  public:
-  explicit MockAutofillExternalDelegate(content::WebContents* web_contents,
-                                        AutofillManager* autofill_manager)
+  MockAutofillExternalDelegate(content::WebContents* web_contents,
+                               AutofillManager* autofill_manager)
       : TestAutofillExternalDelegate(web_contents, autofill_manager) {}
   virtual ~MockAutofillExternalDelegate() {}
 
   MOCK_METHOD5(OnQuery, void(int query_id,
                              const FormData& form,
                              const FormFieldData& field,
                              const gfx::Rect& bounds,
                              bool display_warning));
 
  private:
@@ skipping 11 matching lines @@
 
   FormData form;
   CreateTestAddressFormData(&form);
   std::vector<FormData> forms(1, form);
   FormsSeen(forms);
   const FormFieldData& field = form.fields[0];
   GetAutofillSuggestions(form, field);  // should call the delegate's OnQuery()
 
   autofill_manager_->SetExternalDelegate(NULL);
 }