<webview>: Partially migrate loadcommit event from content to chrome

chrome/browser/extensions/api/webview/webview_api_constants.h

Index: chrome/browser/extensions/api/webview/webview_api_constants.h
diff --git a/chrome/browser/extensions/api/webview/webview_api_constants.h b/chrome/browser/extensions/api/webview/webview_api_constants.h
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+// Copyright (c) 2013 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.
+
+// Constants used for the WebView API.
+
+#ifndef CHROME_BROWSER_EXTENSIONS_API_WEBVIEW_WEBVIEW_API_CONSTANTS_H_
+#define CHROME_BROWSER_EXTENSIONS_API_WEBVIEW_WEBVIEW_API_CONSTANTS_H_
+
+namespace webview_api_constants {
+
+// Events.
+extern const char kEventLoadCommit[];
+
+// Parameters/properties on events.
+extern const char kIsTopLevel[];
+extern const char kUrl[];
+
+}  // namespace webview_api_constants
+
+#endif  // CHROME_BROWSER_EXTENSIONS_API_WEBVIEW_WEBVIEW_API_CONSTANTS_H_
+