Revert 173248, broke building on the official chrome/win bot:

content/gpu/gpu_info_collector.cc

Index: content/gpu/gpu_info_collector.cc
===================================================================
--- content/gpu/gpu_info_collector.cc	(revision 173266)
+++ content/gpu/gpu_info_collector.cc	(working copy)
@@ -94,45 +94,33 @@
 
   gpu_info->gl_renderer = GetGLString(GL_RENDERER);
   gpu_info->gl_vendor = GetGLString(GL_VENDOR);
-  gpu_info->gl_extensions = GetGLString(GL_EXTENSIONS);
-  gpu_info->gl_version_string = GetGLString(GL_VERSION);
-  std::string glsl_version_string = GetGLString(GL_SHADING_LANGUAGE_VERSION);
+  gpu_info->gl_version_string =GetGLString(GL_VERSION);
+  gpu_info->gl_extensions =GetGLString(GL_EXTENSIONS);
+
+  bool validGLVersionInfo = CollectGLVersionInfo(gpu_info);
+  bool validVideoCardInfo = CollectVideoCardInfo(gpu_info);
+  bool validDriverInfo = CollectDriverInfoGL(gpu_info);
+
   // TODO(kbr): remove once the destruction of a current context automatically
   // clears the current context.
   context->ReleaseCurrent(surface.get());
 
-  gpu_info->gl_version = GetVersionFromString(gpu_info->gl_version_string);
+  return (validGLVersionInfo && validVideoCardInfo && validDriverInfo);
+}
+
+bool CollectGLVersionInfo(content::GPUInfo* gpu_info) {
+  std::string gl_version_string = gpu_info->gl_version_string;
+  std::string glsl_version_string =
+      GetGLString(GL_SHADING_LANGUAGE_VERSION);
+
+  gpu_info->gl_version = GetVersionFromString(gl_version_string);
+
   std::string glsl_version = GetVersionFromString(glsl_version_string);
   gpu_info->pixel_shader_version = glsl_version;
   gpu_info->vertex_shader_version = glsl_version;
 
-  return CollectDriverInfoGL(gpu_info);
+  return true;
 }
 
-void MergeGPUInfoGL(content::GPUInfo* basic_gpu_info,
-                    const content::GPUInfo& context_gpu_info) {
-  DCHECK(basic_gpu_info);
-  basic_gpu_info->gl_renderer = context_gpu_info.gl_renderer;
-  basic_gpu_info->gl_vendor = context_gpu_info.gl_vendor;
-  basic_gpu_info->gl_version_string = context_gpu_info.gl_version_string;
-  basic_gpu_info->gl_extensions = context_gpu_info.gl_extensions;
-  basic_gpu_info->gl_version = context_gpu_info.gl_version;
-  basic_gpu_info->pixel_shader_version =
-      context_gpu_info.pixel_shader_version;
-  basic_gpu_info->vertex_shader_version =
-      context_gpu_info.vertex_shader_version;
-
-  if (!context_gpu_info.driver_vendor.empty())
-    basic_gpu_info->driver_vendor = context_gpu_info.driver_vendor;
-  if (!context_gpu_info.driver_version.empty())
-    basic_gpu_info->driver_version = context_gpu_info.driver_version;
-
-  basic_gpu_info->can_lose_context = context_gpu_info.can_lose_context;
-  basic_gpu_info->sandboxed = context_gpu_info.sandboxed;
-  basic_gpu_info->gpu_accessible = context_gpu_info.gpu_accessible;
-  basic_gpu_info->finalized = context_gpu_info.finalized;
-  basic_gpu_info->initialization_time = context_gpu_info.initialization_time;
-}
-
 }  // namespace gpu_info_collector