Fixes for re-enabling more MSVC level 4 warnings: gpu/ edition

gpu/command_buffer/service/texture_manager_unittest.cc

Index: gpu/command_buffer/service/texture_manager_unittest.cc
diff --git a/gpu/command_buffer/service/texture_manager_unittest.cc b/gpu/command_buffer/service/texture_manager_unittest.cc
index 9ca769369c94d36039b70e57707650373dbf07e3..bd2585522da8cd1a681b559aa68f8c486ff9fcca 100644
--- a/gpu/command_buffer/service/texture_manager_unittest.cc
+++ b/gpu/command_buffer/service/texture_manager_unittest.cc
@@ -1062,8 +1062,8 @@ TEST_F(TextureTest, GetLevelType) {
                          GL_RGBA,
                          GL_UNSIGNED_BYTE,
                          true);
-  GLenum type = -1;
-  GLenum format = -1;
+  GLenum type = 0;
+  GLenum format = 0;
   Texture* texture = texture_ref_->texture();
   EXPECT_FALSE(texture->GetLevelType(GL_TEXTURE_2D, -1, &type, &format));
   EXPECT_FALSE(texture->GetLevelType(GL_TEXTURE_2D, 1000, &type, &format));