Change most uses of Pickle to base::Pickle

There should be no behavior change.

TBR=jschuh (IPC messages)

Review URL: https://codereview.chromium.org/1154283003

Cr-Commit-Position: refs/heads/master@{#332552}
diff --git a/ipc/ipc_fuzzing_tests.cc b/ipc/ipc_fuzzing_tests.cc
index 42fa859..c19d842 100644
--- a/ipc/ipc_fuzzing_tests.cc
+++ b/ipc/ipc_fuzzing_tests.cc
@@ -44,7 +44,7 @@
   EXPECT_TRUE(m.WriteInt(v1));
   EXPECT_TRUE(m.WriteInt(v2));
 
-  PickleIterator iter(m);
+  base::PickleIterator iter(m);
   std::string vs;
   EXPECT_FALSE(iter.ReadString(&vs));
 }
@@ -57,7 +57,7 @@
   EXPECT_TRUE(m.WriteInt(v1));
   EXPECT_TRUE(m.WriteInt(v2));
 
-  PickleIterator iter(m);
+  base::PickleIterator iter(m);
   base::string16 vs;
   EXPECT_FALSE(iter.ReadString16(&vs));
 }
@@ -68,7 +68,7 @@
   EXPECT_TRUE(m.WriteInt(1));
   EXPECT_TRUE(m.WriteInt(2));
 
-  PickleIterator iter(m);
+  base::PickleIterator iter(m);
   const char* data = NULL;
   EXPECT_TRUE(iter.ReadBytes(&data, sizeof(int)));
 }
@@ -84,7 +84,7 @@
   EXPECT_TRUE(m.WriteInt(3));
 
   std::vector<double> vec;
-  PickleIterator iter(m);
+  base::PickleIterator iter(m);
   EXPECT_FALSE(ReadParam(&m, &iter, &vec));
 }
 
@@ -97,7 +97,7 @@
   EXPECT_TRUE(m.WriteInt64(2));
 
   std::vector<int64> vec;
-  PickleIterator iter(m);
+  base::PickleIterator iter(m);
   EXPECT_FALSE(ReadParam(&m, &iter, &vec));
 }
 
@@ -111,7 +111,7 @@
   EXPECT_TRUE(m.WriteInt64(2));
 
   std::vector<int64> vec;
-  PickleIterator iter(m);
+  base::PickleIterator iter(m);
   EXPECT_FALSE(ReadParam(&m, &iter, &vec));
 }
 
@@ -213,7 +213,7 @@
       return false;
     int msg_value1 = 0;
     int msg_value2 = 0;
-    PickleIterator iter(*last_msg_);
+    base::PickleIterator iter(*last_msg_);
     if (!iter.ReadInt(&msg_value1))
       return false;
     if (!iter.ReadInt(&msg_value2))