Change default timestamp to 64 bits in all webrtc directories.

webrtc/base/gunit.h

Index: webrtc/base/gunit.h
diff --git a/webrtc/base/gunit.h b/webrtc/base/gunit.h
index 986d4dcb623d70000679589b91d85fad00ca919e..c5a9bad27e9d95d1b58d88f6980a65ec2a69c019 100644
--- a/webrtc/base/gunit.h
+++ b/webrtc/base/gunit.h
@@ -16,21 +16,22 @@
 #include "testing/gtest/include/gtest/gtest.h"
 
 // Wait until "ex" is true, or "timeout" expires.
-#define WAIT(ex, timeout)                                                     \
-  for (uint32_t start = rtc::Time(); !(ex) && rtc::Time() < start + timeout;) \
+#define WAIT(ex, timeout)                             \
+  for (int64_t start = rtc::TimeMillis();             \
+       !(ex) && rtc::TimeMillis() < start + timeout;) \
     rtc::Thread::Current()->ProcessMessages(1);
 
 // This returns the result of the test in res, so that we don't re-evaluate
 // the expression in the XXXX_WAIT macros below, since that causes problems
 // when the expression is only true the first time you check it.
-#define WAIT_(ex, timeout, res)                     \
-  do {                                              \
-    uint32_t start = rtc::Time();                   \
-    res = (ex);                                     \
-    while (!res && rtc::Time() < start + timeout) { \
-      rtc::Thread::Current()->ProcessMessages(1);   \
-      res = (ex);                                   \
-    }                                               \
+#define WAIT_(ex, timeout, res)                           \
+  do {                                                    \
+    int64_t start = rtc::TimeMillis();                    \
+    res = (ex);                                           \
+    while (!res && rtc::TimeMillis() < start + timeout) { \
+      rtc::Thread::Current()->ProcessMessages(1);         \
+      res = (ex);                                         \
+    }                                                     \
   } while (0)
 
 // The typical EXPECT_XXXX and ASSERT_XXXXs, but done until true or a timeout.