Remove SkDEBUGFAILs that are problematic for Chromium

BUG=368107
R=egdaniel@google.com

Author: bsalomon@google.com

Review URL: https://codereview.chromium.org/268683003

git-svn-id: http://skia.googlecode.com/svn/trunk@14508 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/gpu/gl/GrGLUtil.cpp b/src/gpu/gl/GrGLUtil.cpp
index ddfcfbf..0fa2d2c 100644
--- a/src/gpu/gl/GrGLUtil.cpp
+++ b/src/gpu/gl/GrGLUtil.cpp
@@ -99,7 +99,7 @@
 
 GrGLStandard GrGLGetStandardInUseFromString(const char* versionString) {
     if (NULL == versionString) {
-        SkDEBUGFAIL("NULL GL version string.");
+        SkDebugf("NULL GL version string.");
         return kNone_GrGLStandard;
     }
 
@@ -139,7 +139,7 @@
 
 GrGLVersion GrGLGetVersionFromString(const char* versionString) {
     if (NULL == versionString) {
-        SkDEBUGFAIL("NULL GL version string.");
+        SkDebugf("NULL GL version string.");
         return GR_GL_INVALID_VER;
     }
 
@@ -178,7 +178,7 @@
 
 GrGLSLVersion GrGLGetGLSLVersionFromString(const char* versionString) {
     if (NULL == versionString) {
-        SkDEBUGFAIL("NULL GLSL version string.");
+        SkDebugf("NULL GLSL version string.");
         return GR_GLSL_INVALID_VER;
     }