Simplify skiatest framework.

tests/DocumentTest.cpp

 #include "Test.h"
 
 #include "SkCanvas.h"
 #include "SkDocument.h"
 #include "SkOSFile.h"
 #include "SkStream.h"
 
 static void test_empty(skiatest::Reporter* reporter) {
     SkDynamicMemoryWStream stream;
 
@@ skipping 11 matching lines @@
     SkCanvas* canvas = doc->beginPage(100, 100);
     canvas->drawColor(SK_ColorRED);
     doc->endPage();
 
     doc->abort();
 
     REPORTER_ASSERT(reporter, stream.bytesWritten() == 0);
 }
 
 static void test_abortWithFile(skiatest::Reporter* reporter) {
-    SkString tmpDir = skiatest::Test::GetTmpDir();
+    SkString tmpDir = skiatest::GetTmpDir();
 
     if (tmpDir.isEmpty()) {
         return;  // TODO(edisonn): unfortunatelly this pattern is used in other
                  // tests, but if GetTmpDir() starts returning and empty dir
                  // allways, then all these tests will be disabled.
     }
 
     SkString path = SkOSPath::Join(tmpDir.c_str(), "aborted.pdf");
 
     // Make sure doc's destructor is called to flush.
     {
         SkAutoTUnref<SkDocument> doc(SkDocument::CreatePDF(path.c_str()));
 
         SkCanvas* canvas = doc->beginPage(100, 100);
         canvas->drawColor(SK_ColorRED);
         doc->endPage();
 
         doc->abort();
     }
 
     FILE* file = fopen(path.c_str(), "r");
     // The created file should be empty.
     char buffer[100];
     REPORTER_ASSERT(reporter, fread(buffer, 1, 1, file) == 0);
     fclose(file);
 }
 
 static void test_file(skiatest::Reporter* reporter) {
-    SkString tmpDir = skiatest::Test::GetTmpDir();
+    SkString tmpDir = skiatest::GetTmpDir();
     if (tmpDir.isEmpty()) {
         return;  // TODO(edisonn): unfortunatelly this pattern is used in other
                  // tests, but if GetTmpDir() starts returning and empty dir
                  // allways, then all these tests will be disabled.
     }
 
     SkString path = SkOSPath::Join(tmpDir.c_str(), "file.pdf");
 
     SkAutoTUnref<SkDocument> doc(SkDocument::CreatePDF(path.c_str()));
 
@@ skipping 24 matching lines @@
     REPORTER_ASSERT(reporter, stream.bytesWritten() != 0);
 }
 
 DEF_TEST(document_tests, reporter) {
     test_empty(reporter);
     test_abort(reporter);
     test_abortWithFile(reporter);
     test_file(reporter);
     test_close(reporter);
 }