IVGCVSW-5846 Remove TODO statements from Armnn Code

 * Removed all instances of TODO statements from comments
 * Removed statements are noted as part of IVGCVSW-5846
 * Removed ProtoxtFixture.cpp from the Onnx Parser tests as it's not used

Signed-off-by: David Monahan <david.monahan@arm.com>
Change-Id: Ia0a15f8a0d4123c8831638634eaa0d1018c40e2c
diff --git a/src/backends/cl/test/ClRuntimeTests.cpp b/src/backends/cl/test/ClRuntimeTests.cpp
index db01fa7..8426c5f 100644
--- a/src/backends/cl/test/ClRuntimeTests.cpp
+++ b/src/backends/cl/test/ClRuntimeTests.cpp
@@ -138,7 +138,7 @@
     CHECK(leakedBefore == leakedAfter);
 
     // Add resonable threshold after and before running valgrind with the ACL clear cache function.
-    // TODO Threshold set to 80k until the root cause of the memory leakage is found and fixed. Revert threshold
+    // Threshold set to 80k until the root cause of the memory leakage is found and fixed. Revert threshold
     // value to 1024 when fixed.
     CHECK(static_cast<long>(reachableAfter) - static_cast<long>(reachableBefore) < 81920);