Remove unnecessary WebGraphicsContext3D::reshape.. call from TestPlugin

WebGraphicsContext3D::reshape..() resizes the default backbuffer, but the
TestPlugin doesn't use the default backbuffer so this call is a no-op.

BUG=181120

Review URL: https://codereview.chromium.org/137613002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@245124 0039d316-1c4b-4281-b951-d872f2087c98

content/shell/renderer/test_runner/TestPlugin.cpp

@@ -244,7 +244,6 @@ void TestPlugin::updateGeometry(const WebRect& frameRect, const WebRect& clipRec
     if (m_rect.isEmpty())
         return;
 
-    m_context->reshapeWithScaleFactor(m_rect.width, m_rect.height, 1.f);
     m_context->viewport(0, 0, m_rect.width, m_rect.height);
 
     m_context->bindTexture(GL_TEXTURE_2D, m_colorTexture);