Move ".crx"/".pem" constants and extension_filenames constants into extensions/common/constants.cc.

extensions/common/constants.h

Index: extensions/common/constants.h
diff --git a/extensions/common/constants.h b/extensions/common/constants.h
index aeb9e674acbd69840180aaaad1562e8ba7bb9dc3..492ddbc27b44dc5af8c9df3a9d117115ab08fa18 100644
--- a/extensions/common/constants.h
+++ b/extensions/common/constants.h
@@ -28,6 +28,30 @@ extern const base::FilePath::CharType kPlatformSpecificFolder[];
 // installed to.
 extern const char kInstallDirectoryName[];
 
+// The name of a temporary directory to install an extension into for
+// validation before finalizing install.
+extern const char kTempExtensionName[];
+
+// The file to write our decoded images to, relative to the extension_path.
+extern const char kDecodedImagesFilename[];
+
+// The file to write our decoded message catalogs to, relative to the
+// extension_path.
+extern const char kDecodedMessageCatalogsFilename[];
+
+// The filename to use for a background page generated from
+// background.scripts.
+extern const char kGeneratedBackgroundPageFilename[];
+
+// Path to imported modules.
+extern const char kModulesDir[];
+
+// The file extension (.crx) for extensions.
+extern const base::FilePath::CharType kExtensionFileExtension[];
+
+// The file extension (.pem) for private key files.
+extern const base::FilePath::CharType kExtensionKeyFileExtension[];
+
 }  // namespace extensions
 
 #endif  // EXTENSIONS_COMMON_CONSTANTS_H_