Don't issue any extra geometry for the IOSurface leak workaround

content/browser/renderer_host/compositing_iosurface_mac.mm

Index: content/browser/renderer_host/compositing_iosurface_mac.mm
diff --git a/content/browser/renderer_host/compositing_iosurface_mac.mm b/content/browser/renderer_host/compositing_iosurface_mac.mm
index 2013eb718a5d6e928fbc841fbe1947d92decc58c..9e4887a0982219da5f6d0b97c37c1ea9b6b4b576 100644
--- a/content/browser/renderer_host/compositing_iosurface_mac.mm
+++ b/content/browser/renderer_host/compositing_iosurface_mac.mm
@@ -386,11 +386,13 @@ void CompositingIOSurfaceMac::DrawIOSurface(NSView* view, float scale_factor) {
       }
     }
 
-    glUseProgram(0); CHECK_GL_ERROR();
+    // Workaround for issue 158469. Issue a dummy draw call with texture_ not
+    // bound to blit_rgb_sampler_location_, in order to shake all references
+    // to the IOSurface out of the driver.
+    glBegin(GL_TRIANGLES);
+    glEnd();
 
-    // Issue a dummy draw call to flush references to the IOSurface out of
-    // the GL driver.
-    DoWorkaroundForIOSurfaceLeak();
+    glUseProgram(0); CHECK_GL_ERROR();
   } else {
     // Should match the clear color of RenderWidgetHostViewMac.
     glClearColor(1.0f, 1.0f, 1.0f, 1.0f);
@@ -530,34 +532,6 @@ void CompositingIOSurfaceMac::DrawQuad(const SurfaceQuad& quad) {
   glDisableClientState(GL_TEXTURE_COORD_ARRAY);
 }
 
-void CompositingIOSurfaceMac::DoWorkaroundForIOSurfaceLeak() {
-  if (!shader_program_blit_rgb_)
-    return;
-
-  glMatrixMode(GL_PROJECTION);
-  glLoadIdentity();
-  glOrtho(0, 1, 0, 1, -1, 1);
-  glMatrixMode(GL_MODELVIEW);
-  glLoadIdentity();
-
-  // Workaround for issue 158469. Issue a dummy draw call with texture_ not
-  // bound to blit_rgb_sampler_location_, in order to shake all references
-  // to the IOSurface out of the driver.
-  glUseProgram(shader_program_blit_rgb_);
-  glUniform1i(blit_rgb_sampler_location_, 0);
-  glActiveTexture(GL_TEXTURE0 + 0);
-  glBindTexture(GL_TEXTURE_RECTANGLE_ARB, 0);
-
-  // Let invisible_quad be a quad that is outside of the viewport.
-  SurfaceQuad invisible_quad;
-  invisible_quad.set_rect(-2.0f, -2.0f, -1.9f, -1.9f);
-  invisible_quad.set_texcoord_rect(0.0f, 0.0f, 1.0f, 1.0f);
-  DrawQuad(invisible_quad);
-  glUseProgram(0);
-
-  CHECK_GL_ERROR();
-}
-
 void CompositingIOSurfaceMac::UnrefIOSurfaceWithContextCurrent() {
   if (texture_) {
     glDeleteTextures(1, &texture_);