base: Remove the string logging from CHECK().

chrome/browser/chromeos/login/screenshot_testing/screenshot_tester.cc

Index: chrome/browser/chromeos/login/screenshot_testing/screenshot_tester.cc
diff --git a/chrome/browser/chromeos/login/screenshot_testing/screenshot_tester.cc b/chrome/browser/chromeos/login/screenshot_testing/screenshot_tester.cc
index a1eadf1a522a78d1006820cb639d502808c6e71c..25790203302b9ccbe91b4c06e0bc67b6a678dba1 100644
--- a/chrome/browser/chromeos/login/screenshot_testing/screenshot_tester.cc
+++ b/chrome/browser/chromeos/login/screenshot_testing/screenshot_tester.cc
@@ -59,12 +59,12 @@ bool ScreenshotTester::TryInitialize() {
 
   std::string mode = command_line.GetSwitchValueASCII(
       switches::kEnableScreenshotTestingWithMode);
-  CHECK(mode == kUpdateMode || mode == kTestMode || mode == kPdiffTestMode)
-      << "Invalid mode for screenshot testing: " << mode;
+  // Invalid mode for screenshot testing.
+  CHECK(mode == kUpdateMode || mode == kTestMode || mode == kPdiffTestMode);
 
-  CHECK(command_line.HasSwitch(chromeos::switches::kGoldenScreenshotsDir))
-      << "No directory with golden screenshots specified, use "
-         "--golden-screenshots-dir";
+  // No directory with golden screenshots specified, use
+  // --golden-screenshots-dir
+  CHECK(command_line.HasSwitch(chromeos::switches::kGoldenScreenshotsDir));
 
   golden_screenshots_dir_ =
       command_line.GetSwitchValuePath(switches::kGoldenScreenshotsDir);
@@ -122,8 +122,8 @@ void ScreenshotTester::Run(const std::string& test_name) {
       GetImageFilePath(test_name, kGoldenScreenshot);
   PNGFile golden_screenshot = LoadGoldenScreenshot(golden_screenshot_path);
   if (test_mode_) {
-    CHECK(golden_screenshot.get())
-        << "A golden screenshot is required for screenshot testing";
+    // A golden screenshot is required for screenshot testing
+    CHECK(golden_screenshot.get());
     VLOG(0) << "Loaded golden screenshot";
     Result result = CompareScreenshots(golden_screenshot, current_screenshot);
     VLOG(0) << "Compared";
@@ -237,7 +237,8 @@ ScreenshotTester::PNGFile ScreenshotTester::LoadGoldenScreenshot(
   base::GetFileSize(image_path, &golden_screenshot_size);
 
   if (golden_screenshot_size == -1) {
-    CHECK(false) << "Can't get golden screenshot size";
+    // Can't get golden screenshot size
+    CHECK(false);
   }
   PNGFile png_data = new base::RefCountedBytes;
   png_data->data().resize(golden_screenshot_size);
@@ -330,9 +331,9 @@ ScreenshotTester::Result ScreenshotTester::CompareScreenshotsRegularly(
 
   testing_result.diff_image = new base::RefCountedBytes;
   testing_result.diff_image->data().resize(result.rgbDiffBitmap.getSize());
-  CHECK(gfx::PNGCodec::EncodeBGRASkBitmap(
-      result.rgbDiffBitmap, false, &testing_result.diff_image->data()))
-      << "Could not encode difference to PNG";
+  // Could not encode difference to PNG
+  CHECK(gfx::PNGCodec::EncodeBGRASkBitmap(result.rgbDiffBitmap, false,
+                                          &testing_result.diff_image->data()));
 
   return testing_result;
 }