Revert of Treat bad values passed to --images as a fatal error

tools/flags/SkCommonFlags.h

Index: tools/flags/SkCommonFlags.h
diff --git a/tools/flags/SkCommonFlags.h b/tools/flags/SkCommonFlags.h
index 8e00e7516c14419d8fee650e540fc38d96fe6cc9..127d37328eb1b05981e72414ce94a33e837a6b27 100644
--- a/tools/flags/SkCommonFlags.h
+++ b/tools/flags/SkCommonFlags.h
@@ -9,8 +9,6 @@
 #define SK_COMMON_FLAGS_H
 
 #include "SkCommandLineFlags.h"
-#include "SkTArray.h"
-#include "SkString.h"
 
 DECLARE_bool(cpu);
 DECLARE_bool(dryRun);
@@ -32,18 +30,4 @@
 DECLARE_string(key);
 DECLARE_string(properties);
 
-/**
- *  Helper to assist in collecting image paths from --images.
- *
- *  Populates an array of strings with paths to images to test.
- *
- *  Returns true if each argument to --images is meaningful:
- *  - If the file/directory does not exist, return false.
- *  - If a directory passed to --images does not have any supported images (based on file
- *  type), return false.
- *  - If a file is passed to --images, assume the user is deliberately testing this image,
- *  regardless of file type.
- */
-bool CollectImages(SkTArray<SkString>*);
-
 #endif