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

content/common/quota_dispatcher.cc

 // Copyright (c) 2011 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 "content/common/quota_dispatcher.h"
 
 #include "base/basictypes.h"
 #include "content/common/child_thread.h"
 #include "content/common/quota_messages.h"
 #include "googleurl/src/gurl.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebStorageQuotaCallbacks.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebStorageQuotaType.h"
 
 using quota::QuotaStatusCode;
 using quota::StorageType;
 
 using WebKit::WebStorageQuotaCallbacks;
 using WebKit::WebStorageQuotaError;
 using WebKit::WebStorageQuotaType;
 
 namespace content {
 namespace {
 
 // QuotaDispatcher::Callback implementation for WebStorageQuotaCallbacks.
 class WebStorageQuotaDispatcherCallback : public QuotaDispatcher::Callback {
  public:
-  WebStorageQuotaDispatcherCallback(WebKit::WebStorageQuotaCallbacks* callback)
+  explicit WebStorageQuotaDispatcherCallback(
+      WebKit::WebStorageQuotaCallbacks* callback)
       : callbacks_(callback) {
     DCHECK(callbacks_);
   }
   virtual ~WebStorageQuotaDispatcherCallback() {}
   virtual void DidQueryStorageUsageAndQuota(int64 usage, int64 quota) OVERRIDE {
     callbacks_->didQueryStorageUsageAndQuota(usage, quota);
   }
   virtual void DidGrantStorageQuota(int64 granted_quota) OVERRIDE {
     callbacks_->didGrantStorageQuota(granted_quota);
   }
@@ skipping 93 matching lines @@
                int(quota::kStorageTypeTemporary), mismatching_enums);
 COMPILE_ASSERT(int(WebKit::WebStorageQuotaTypePersistent) == \
                int(quota::kStorageTypePersistent), mismatching_enums);
 
 COMPILE_ASSERT(int(WebKit::WebStorageQuotaErrorNotSupported) == \
                int(quota::kQuotaErrorNotSupported), mismatching_enums);
 COMPILE_ASSERT(int(WebKit::WebStorageQuotaErrorAbort) == \
                int(quota::kQuotaErrorAbort), mismatching_enums);
 
 }  // namespace content