Revert "Fixed compiler warning C4267 'conversion from 'size_t' to 'type', possible loss of data'"

Seems to have quite a few warnings in 64-bit on my machine.

BUG=angleproject:1120

This reverts commit c5cf9bc47d0ee028adbbf9e9f94ca567eec601dc.

Change-Id: I86768b900aeba52e7a2242d9ae8949f93f1a5ba9
Reviewed-on: https://chromium-review.googlesource.com/293280
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Tested-by: Jamie Madill <jmadill@chromium.org>
diff --git a/src/libANGLE/Renderbuffer.cpp b/src/libANGLE/Renderbuffer.cpp
index 02e067c..eb6357e 100644
--- a/src/libANGLE/Renderbuffer.cpp
+++ b/src/libANGLE/Renderbuffer.cpp
@@ -44,8 +44,8 @@
         return error;
     }
 
-    mWidth          = static_cast<GLsizei>(width);
-    mHeight         = static_cast<GLsizei>(height);
+    mWidth = width;
+    mHeight = height;
     mInternalFormat = internalformat;
     mSamples = 0;
 
@@ -62,10 +62,10 @@
         return error;
     }
 
-    mWidth          = static_cast<GLsizei>(width);
-    mHeight         = static_cast<GLsizei>(height);
+    mWidth = width;
+    mHeight = height;
     mInternalFormat = internalformat;
-    mSamples        = static_cast<GLsizei>(samples);
+    mSamples = samples;
 
     return Error(GL_NO_ERROR);
 }
@@ -82,8 +82,8 @@
 
     setTargetImage(image);
 
-    mWidth          = static_cast<GLsizei>(image->getWidth());
-    mHeight         = static_cast<GLsizei>(image->getHeight());
+    mWidth          = image->getWidth();
+    mHeight         = image->getHeight();
     mInternalFormat = image->getInternalFormat();
     mSamples        = 0;