Revert of Disable failing tests on Mac 10.10 Release (ATI) (patchset c…

…hromium#1 id:1 of https://codereview.chromium.org/1456863003/ )

Reason for revert:
Per research and discussion on http://crbug.com/557929, we are pretty sure the bot is to blame and NOT the CLs or these tests.

Original issue's description:
> Disable failing tests on Mac 10.10 Release (ATI)
>
> Failing tests on Mac OS:
>   CastStreamingApiTestWithPixelOutput.EndToEnd
>   TabCaptureApiPixelTest.EndToEndThroughWebRTC
>   TabCaptureApiPixelTest.EndToEndWithoutRemoting
>
> BUG=557929
> TBR=hubbe@chromium.org, miu@chromium.org
>
> Committed: https://crrev.com/872e59f9875efaad8b73b44cf2707c0a57d52244
> Cr-Commit-Position: refs/heads/master@{#360460}

TBR=hubbe@chromium.org,hcarmona@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=557929

Review URL: https://codereview.chromium.org/1462603003

Cr-Commit-Position: refs/heads/master@{#360634}

chrome/browser/extensions/api/cast_streaming/cast_streaming_apitest.cc

@@ -335,8 +335,7 @@ class CastStreamingApiTestWithPixelOutput : public CastStreamingApiTest {
 //
 // TODO(miu): Now that this test has been long-stable on Release build bots, it
 // should be enabled for the Debug build bots.  http://crbug.com/396413
-// Disabled in MacOS: https://crbug.com/557929
-#if defined(NDEBUG) && !defined(OS_MACOSX)
+#if defined(NDEBUG)
 #define MAYBE_EndToEnd EndToEnd
 #else
 #define MAYBE_EndToEnd DISABLED_EndToEnd

chrome/browser/extensions/api/tab_capture/tab_capture_apitest.cc

@@ -174,13 +174,7 @@ IN_PROC_BROWSER_TEST_F(TabCaptureApiTest, MaxOffscreenTabs) {
 }
 
 // Tests that tab capture video frames can be received in a VIDEO element.
-// Disabled in MacOS: https://crbug.com/557929
-#if defined(OS_MACOSX)
-#define MAYBE_EndToEndWithoutRemoting DISABLED_EndToEndWithoutRemoting
-#else
-#define MAYBE_EndToEndWithoutRemoting EndToEndWithoutRemoting
-#endif
-IN_PROC_BROWSER_TEST_F(TabCaptureApiPixelTest, MAYBE_EndToEndWithoutRemoting) {
+IN_PROC_BROWSER_TEST_F(TabCaptureApiPixelTest, EndToEndWithoutRemoting) {
   if (IsTooIntensiveForThisPlatform()) {
     LOG(WARNING) << "Skipping this CPU-intensive test on this platform/build.";
     return;
@@ -195,13 +189,7 @@ IN_PROC_BROWSER_TEST_F(TabCaptureApiPixelTest, MAYBE_EndToEndWithoutRemoting) {
 // received in a VIDEO element.  More allowance is provided for color deviation
 // because of the additional layers of video processing performed within
 // WebRTC.
-// Disabled in MacOS: https://crbug.com/557929
-#if defined(OS_MACOSX)
-#define MAYBE_EndToEndThroughWebRTC DISABLED_EndToEndThroughWebRTC
-#else
-#define MAYBE_EndToEndThroughWebRTC EndToEndThroughWebRTC
-#endif
-IN_PROC_BROWSER_TEST_F(TabCaptureApiPixelTest, MAYBE_EndToEndThroughWebRTC) {
+IN_PROC_BROWSER_TEST_F(TabCaptureApiPixelTest, EndToEndThroughWebRTC) {
   if (IsTooIntensiveForThisPlatform()) {
     LOG(WARNING) << "Skipping this CPU-intensive test on this platform/build.";
     return;