Move kFileScheme constant into content namespace.

android_webview/native/android_protocol_handler.cc

Index: android_webview/native/android_protocol_handler.cc
diff --git a/android_webview/native/android_protocol_handler.cc b/android_webview/native/android_protocol_handler.cc
index 407f62f1dffea489bc937a3d370deb8246cba021..e94c5580491c5042a22863fc897cd6920ad9af6b 100644
--- a/android_webview/native/android_protocol_handler.cc
+++ b/android_webview/native/android_protocol_handler.cc
@@ -229,10 +229,10 @@ net::URLRequestJob* AndroidProtocolHandlerBase::MaybeCreateJob(
 // AssetFileProtocolHandler ---------------------------------------------------
 
 AssetFileProtocolHandler::AssetFileProtocolHandler()
-    : asset_prefix_(std::string(chrome::kFileScheme) +
+    : asset_prefix_(std::string(content::kFileScheme) +
                     std::string(content::kStandardSchemeSeparator) +
                     android_webview::kAndroidAssetPath),
-      resource_prefix_(std::string(chrome::kFileScheme) +
+      resource_prefix_(std::string(content::kFileScheme) +
                        std::string(content::kStandardSchemeSeparator) +
                        android_webview::kAndroidResourcePath) {
 }