Remove nullchecks for the provider's context.

third_party/WebKit/Source/platform/graphics/ImageBuffer.cpp

Index: third_party/WebKit/Source/platform/graphics/ImageBuffer.cpp
diff --git a/third_party/WebKit/Source/platform/graphics/ImageBuffer.cpp b/third_party/WebKit/Source/platform/graphics/ImageBuffer.cpp
index 64a4543d75ab20d2bf2aee9ea3c5fa7ba8d82570..0d45edd0dee92a174b78ba57c5ba1970cc2de7e7 100644
--- a/third_party/WebKit/Source/platform/graphics/ImageBuffer.cpp
+++ b/third_party/WebKit/Source/platform/graphics/ImageBuffer.cpp
@@ -203,8 +203,6 @@ bool ImageBuffer::copyToPlatformTexture(WebGraphicsContext3D* context, Platform3
     if (!provider)
         return false;
     WebGraphicsContext3D* sharedContext = provider->context3d();
-    if (!sharedContext)
-        return false;
 
     OwnPtr<WebExternalTextureMailbox> mailbox = adoptPtr(new WebExternalTextureMailbox);
     mailbox->textureSize = WebSize(textureImage->width(), textureImage->height());
@@ -249,8 +247,6 @@ bool ImageBuffer::copyRenderingResultsFromDrawingBuffer(DrawingBuffer* drawingBu
     if (!provider)
         return false;
     WebGraphicsContext3D* context3D = provider->context3d();
-    if (!context3D)
-        return false;
     Platform3DObject textureId = m_surface->getBackingTextureHandleForOverwrite();
     if (!textureId)
         return false;