Fix bug in Valgrind flags config.

tools/nanobench_flags.py

Index: tools/nanobench_flags.py
diff --git a/tools/nanobench_flags.py b/tools/nanobench_flags.py
index cec48a1809e26a96e10e3c3a721eb5f66300fce1..81cd8cebe096aff272013afc5ff8336927252908 100755
--- a/tools/nanobench_flags.py
+++ b/tools/nanobench_flags.py
@@ -40,9 +40,9 @@ def get_args(bot):
     # Don't care about Valgrind performance.
     args.extend(['--loops',   '1'])
     args.extend(['--samples', '1'])
-    if 'GPU' in bot:
+    if 'Valgrind_GPU' in bot:
       args.append('--nocpu')
-    elif 'CPU' in bot:
+    elif 'Valgrind_CPU' in bot:
       args.append('--nogpu')
 
   match = []
@@ -58,7 +58,7 @@ def get_args(bot):
   if match:
     args.append('--match')
     args.extend(match)
-  
+
 
   if ('GalaxyS3' in bot or
       'GalaxyS4' in bot):
@@ -73,7 +73,7 @@ def self_test():
   cases = [
     'Perf-Android-GalaxyS3-Mali400-Arm7-Release',
     'Perf-Android-Nexus7-Tegra3-Arm7-Release',
-    'Test-Ubuntu12-ShuttleA-GTX550Ti-x86_64-Release-Valgrind_CPU',
+    'Test-Ubuntu14-GCE-NoGPU-x86_64-Release-Valgrind_CPU',
     'Test-Ubuntu12-ShuttleA-GTX550Ti-x86_64-Release-Valgrind_GPU',
     'Test-Win7-ShuttleA-HD2000-x86-Debug-ANGLE',
   ]