Revert "Test: New GMs should be nicely named"

This reverts commit 73ec9a09f36ed1e0921c05924b63dcace069f489.

Reason for revert:
  broke Test-Win7-Clang-Golo-CPU-AVX-x86_64-Debug-All-NativeFonts
    ERROR: 'fontmgr_bounds_1_-0.25Win7' is a bad name.
    ERROR: 'fontmgr_bounds_0.75_0Win7' is a bad name.


Original change's description:
> Test: New GMs should be nicely named
> 
> Motivation:
> 
>     An issue came up a while back with SkQP where some the JUnit testing
>     framework dislikes test names that aren't valid Java identifiers.  I am
>     currently replacing invalid characters with underscores before giving
>     them to JUnit, but that leads to some confusion when trying to grep for
>     the name of a failing test.
> 
>     I propose that going forward, all *new* Skia unit tests and GM names be
>     in the form [A-Za-z][A-Za-z0-9_]* to prevent this sort of confusion.  We
>     won't change 63 existing "bad" tests names.
> 
> This Cl encorces that rule with an assertion in DM.
> 
> Change-Id: Icedce023cd3127d499fbcdcaea485f1ec9e9196b
> Reviewed-on: https://skia-review.googlesource.com/145365
> Reviewed-by: Brian Osman <brianosman@google.com>
> Commit-Queue: Hal Canary <halcanary@google.com>

TBR=halcanary@google.com,brianosman@google.com

Change-Id: I28c619ca767dac221a73594c9e7be412ba2c242c
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/145560
Reviewed-by: Hal Canary <halcanary@google.com>
Commit-Queue: Hal Canary <halcanary@google.com>
diff --git a/dm/DM.cpp b/dm/DM.cpp
index 3485197..d86db82 100644
--- a/dm/DM.cpp
+++ b/dm/DM.cpp
@@ -36,13 +36,12 @@
 #include "SkPngEncoder.h"
 #include "SkScan.h"
 #include "SkSpinlock.h"
+#include "SkTestFontMgr.h"
 #include "SkTHash.h"
 #include "SkTaskGroup.h"
-#include "SkTestFontMgr.h"
 #include "SkTypeface_win.h"
 #include "Test.h"
 #include "Timer.h"
-#include "ValidateGMNames.h"
 #include "ios_utils.h"
 #include "picture_utils.h"
 #include "sk_tool_utils.h"
@@ -1354,8 +1353,6 @@
     SkAutoGraphics ag;
     SkTaskGroup::Enabler enabled(FLAGS_threads);
 
-    ValidateGMNames();
-
     if (nullptr == GetResourceAsData("images/color_wheel.png")) {
         info("Some resources are missing.  Do you need to set --resourcePath?\n");
     }