Fix resolution of local branch name in scm and rebaseline tools.

Tools/Scripts/webkitpy/tool/commands/rebaseline.py

Index: Tools/Scripts/webkitpy/tool/commands/rebaseline.py
diff --git a/Tools/Scripts/webkitpy/tool/commands/rebaseline.py b/Tools/Scripts/webkitpy/tool/commands/rebaseline.py
index 9fc847f51f9b4a4aeb15c4c663e8796eaafa3b8b..d049c66eedc5f5a564661023e66bd91b934fb326 100644
--- a/Tools/Scripts/webkitpy/tool/commands/rebaseline.py
+++ b/Tools/Scripts/webkitpy/tool/commands/rebaseline.py
@@ -843,7 +843,7 @@ class AutoRebaseline(AbstractParallelRebaselineCommand):
 
             # Save the current branch name and checkout a clean branch for the patch.
             old_branch_name = tool.executive.run_command(
-                ["git", "rev-parse", "--symbolic-full-name", "HEAD"])
+                ["git", "rev-parse", "--symbolic-full-name", "HEAD"]).strip()

[Xianzhu, 2015/07/15 21:16:58]

If scm.current_branch() had problem we should fix it instead of fixing it here.

We also need to fix another place calling current_branch() in this file.

[joelo, 2015/07/16 21:48:48]

Done.

             if old_branch_name == "HEAD":
                 # If HEAD is detached use commit SHA instead.
                 old_branch_name = tool.executive.run_command(["git", "rev-parse", "HEAD"])